Mpp- A Puzzle By Prolix

[Matakari]

Good evening, I’m stuck on the following from Prolix for which I seek answers with parsing, thanks in advance.
ACROSS:
27 Support student leaving America to tour India (9) : ????D???D
28 Chess player with success on line (5) : ??I?E
29 Jug's covered in grey-green effluent (8) : ????N???
DOWN:
1 What a drug pusher may do with plant (8) : P?W?O???
6 It's instrumental in beer maker's scam (4,6) : P?S???D?L?
8 Concurred one exiting yard is selfish (6) : S?E???
10 Picking phone maker's phone up right away (13) : B???????R????


http://crypticcrosswords.net/puzzles/monthly-prize-puzzles/mpp-116/

[ProfessorMaisie]

28 'with' = W+HIT+E ('online')

[ProfessorMaisie]

6 BASS FIDDLE

[ProfessorMaisie]

you've got some wrong letters, Matakari - see if you can fix them with these (Bass is a brewery, by the way).

[novalis]

29 sewerage

[elliemay1]

10 blackberrying?

[novalis]

8 greedy

[ProfessorMaisie]

1d HAWKWEED (your 1a is [s]HEARER - I took a look at the puzzle).

[ProfessorMaisie]

and your 10a looks like orangetip, so 10d should start with 'o'.

[Neveracrossword]

10 A. Brimstone...

[ProfessorMaisie]

Yes, that works - 'b' it is!

[ProfessorMaisie]

...sorry, elliemay1 - if I'd spotted your perfect answer for 10d I wouldn't have gone looking.

[ProfessorMaisie]

27 UNDERGIRD

[ProfessorMaisie]

...UNDERGR(a)D - student leaving (a)merica [around I(ndia)]

[Matakari]

Many thanks, ProfessorMaisie et al, this turns out to be quite a challenge. But I am continuing with the remainder for the fun of grasping the setter's technique.

[Neveracrossword]

Matakari, glad we could help- your weekend puzzles aren't going well so far! I'm glad you referred to the fun' of grasping the setter's technique, that must be what keeps you going with the Spectator and the Telegraph and...