Crossword Genius

Set up a portion of gin (4)

Ross

I believe the answer is:

trap

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'gin' 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 trap that I've seen before include "Light horse-drawn carriage" , "mug" , "Bunker; carriage" , "that can let an actor down" , "Rock; carriage; gin" .)

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