The Science Crossword ( Cryptic )

[Matakari]

Back to the charge with the elemental entries in mind! Thanks!

PREAMBLE: Each crossword square can have one or two letters, which must be letters of an elemental symbol, or the letters D or T (for deuterium or tritium). For example, Dalton could be written D(Al)TON.

5d Buck after pubs right inside the city (9)

7d Recorded delivery – posted card right away for redistribution (9)

29d Buses holding functions could be limited (10)

39d Emperor’s current riot about H2 O? (8)

42d Free to distribute if announced without first aid (10)

55d Counted on final rivet before becoming corroded (7)

[Captain2]

55 (rive)T-rusted

[Captain2]

42 Unconfined - anagram of 'if announced' less A(id)

[Captain2]

7 Podcasted - anagram of 'posted card' less R(ight)

[Captain2]

5 Inns-B-r-uck

[Captain2]

29 Bu-sines-ses

[newmodarmy]

39 Hirohito

[newmodarmy]

anagram RIOT HHO and I current

[newmodarmy]

Ir in HIRIHITO is Iridium

[Matakari]

Many thanks, Captain2 and newmodarmy, for your excellent parsed answers! I am still a few clues away, but am in a quandary about entering the elements. For instance, according to the preamble, can one enter two letters in a square?
My example ( provided my answer is correct ):

57 Pinch a piece of waste aluminium (5)  STEAL

( S ) ( TE ) (AL )     Elements: Sulphur, Technetium, Aluminium
 

 

[THECORBYLOON]

Yes, since there are fewer squares than letters in the answer.

[Captain2]

Matakari, from the first line of the preamble - which you gave us

'Each crossword square can have one or two letters'

[Matakari]

Good morning, great parsing and answers! Elemental entries hold my interest as I seek responses for one of two remaining groups of clues. Thanks in advance!  

13 Poll that is starting slowly in the regions (8)

20 Particular form of Oscar snob? (5) 

23 Love to order a dish and mug in the capital (9)

26 Fixed car with tinier design? (9)

 28 Transport the teacher (5)

43 Inspectors of beds? (7)

44 Chemist character owes all at sea ( 7, 9)

 45 Choir outwardly begin rearranging certain passages (7)

49 Brief orders cuts in border clinic (8)

 

[Neveracrossword]

45 Bronchi, passages (in the body). Anagram of Choir and the letters at each end of 'begin'.

[Neveracrossword]

44 Wallace Carothers, anagram.

[Neveracrossword]

23 Mogadishu, another anagram.

[Neveracrossword]

28 Coach, double definition?

[cashier]

26   Inerratic

[cashier]

13    Counties?

[cashier]

20    Boson?

[Matakari]

Thanks,NACW and Cashier, could we verify 13 and 20, and answers for 43, 49? Now this is the last batch after which I’ll be on my own to complete the elements which I’m getting to know better and better.

51 Race Ben around the drink dispenser (4, 3)

59 Slim extremely sick in New York (6)

 61, 21 Across Doctors catch horde with flick director (6, 9)

63 Somehow stole tankards when no-one could see! (5, 8)