Crossword Genius

Snare: section springing back (4)

Ross

I believe the answer is:

trap

'snare' is the definition.
('trap' can be a synonym of 'snare')

I cannot understand how the rest of the clue works.

(Other definitions for trap that I've seen before include "that may catch a speeding motorist" , "Trick" , "one would be ill advised to enter?" , "Kisser" , "that can let an actor down" .)

I've seen this clue in The Times.
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