Crossword Genius

Son leaving belt in corner (4)

Ross

I believe the answer is:

trap

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'corner' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for trap that I've seen before include "that can let an actor down" , "Ambush" , "Rock; carriage; gin" , "Device to catch prey" , "that may be sprung?" .)

I've seen this clue in The Telegraph.
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