Crossword Genius

Some gunpowder, say, for crook (3,4)

Ross

I believe the answer is:

tea leaf

I believe this is a double definition.

'some gunpowder say' is the first definition.
(gunpowder is a type of tea)

'crook' is the second definition.
(tea leaf is Cockney rhyming slang for a thief)

'for' acts as a link.

(Other definitions for tea leaf that I've seen before include "one exhibiting a fortune?" , "One from Assam perhaps" , "Couple" , "ending up in hot water" , "Cockney crook" .)

I've seen this clue in The Times.
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