Catch not entirely lifted (4)

I believe the answer is:

trap

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'catch' is the definition.
(trapping is a kind of catching)

I don't understand the rest of the clue.

(Other definitions for trap that I've seen before include "Catch; two-wheeled carriage" , "Golfing hazard" , "ladder" , "one would be ill advised to enter?" , "that can let an actor down" .)

I've seen this clue in The Telegraph.

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