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23d Ground Arsenal's trained on? Pitch has become draughtier reportedly (6,4)
Is it TARGET AREA

32a Black belts a certain lenghth suitable for flogging(8)
Is it SELLABLE

36A Friend of merchant seaman turning round in a vessel from the east(8)
?a?s?n?o

YES
YES
BASSANIO

thanks dandelion. Is 43a San Jose?
Clue is: US city kid's almost entirely occupied with marbles perhaps (3,4)

Is 4d HERETIC?
Clue is: You take itsucker curtailed his controversial views (7)

Yes

Take it = here
Tic(k)

and

SAN JOS(H)E (Sane = has marbles)