Pass for a mere youngster (4)

I believe the answer is:

chit

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'youngster' is the definition.
(I have seen 'Impudent youngster' mean 'chit' so perhaps 'youngster' could also mean 'chit')

I don't understand the remainder of the clue.

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(Other definitions for chit that I've seen before include "struck" , "A short written note" , "Impudent youngster" , "Informal receipt" , "Note - voucher" .)

I've seen this clue in The Globe and Mail.

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