Crossword Genius

Gangleader squeezed deficient composer for a drink (10)

Ross

I believe the answer is:

cappuccino

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'for a drink' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for cappuccino that I've seen before include "Frothy coffee" , "Drink" , "Type of coffee" .)

I've seen this clue in the Sydney Morning Herald.
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