Speccie # 2467

[Matakari]

Got some pretty straightforward clues from Doc, but am stuck on the following for which I would like to have answers/hints, please! I am determined then to discover the unclueds and the theme on my own! Many thanks in advance!
ACROSS:
16 Service of diplomat in Serbia (6) : ?AT??? ( MATINS? )
40 Dutch city where ginger nut’s first on order (9): ????????N

DOWN:
1 Rode in a crosscountry motorbike race, having urges for snack
(13, two wds):
??R???L?D??P?
4 Rock he sculpted on head of Hercules first (6): S???I??
23 Rare rain storm about end of contract
payments (8, two wds):
I?A??A??
30 Garden game take-away to carry on
Northumbrian river (6): ???O?T
32 Aid to climbing in ostentatiously good
fashion (5) : ??E??
36 22 rush and streak (4): ?R??

[Neveracrossword]

16 Hidden in the clue
32 Your E is wrong.
1 D Your P is wrong. The first word in the answer = rode in a cross-country motorbike race.

[Neveracrossword]

36 Your R is wrong
30 Your O is wrong.

[Neveracrossword]

Glad you're going to tackle the unclued entried and the theme on your own. It is very specific to the UK this week.

[bookbinder]

40ac Groningen?

[Neveracrossword]

Yes, Bookbinder.
Matakari, you're showing 7 letters for 4 D, it's only 6(and it looks like you have one wrong there too.)

[ladyalex]

32 split the answer into 2 words 2,3
First means ostentatious good or holy(2)
Second is an unusual word meaning fashion, style (3)

[bookbinder]

23dn in arrear

[Matakari]

Thanks, all! I need to revisit 30, 32 and 36 now before moving on to the unclued lights.

[ProfessorMaisie]

You might not have heard of the Northumbrian river in 30 - it isn't very well known - but the 'garden game' is the obvious one (there's a Q in the word).
36 is just a triple definition clue (22 is a word like 'ancestry').
Two short synonyms constitute the wordplay in 36 (2 letters and 3 letters).

[ProfessorMaisie]

... by the way, the wordplay in 30 makes more sense when the punctuation changes to -
'...take away to carry' (so, carry away the 1 letter abbrev for 'take' from the game).

[Matakari]

My thanks to the generous nature of all you kind people for your help! I've got the unclueds and have completed another interesting one! Have a great week-end!

[Neveracrossword]

Thanks, Matakari. Glad you got it finished - yes, ABers are indeed invaluable!