Crossword Genius

Ask for money from hoodlum exchanging grand for cocaine (5)

Ross

I believe the answer is:

touch

'ask for money from' is the definition.
(touch can mean to pressure someone for money)

I don't understand how the remainder of the clue works.

(Other definitions for touch that I've seen before include "Manner of playing piano, say" , "Hint" , "Pinch" , "spot" , "Move" .)

I've seen this clue in The Guardian.
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