Retreats from animals finally caught in snares (5)
I believe the answer is:
nests
'retreats' is the definition.
(I know this)
'animals finally caught in snares' is the wordplay.
'finally' says to take the final letters.
'caught in' is an insertion indicator.
'snares' becomes 'nets' (I've seen this in another clue).
The last letter of 'animals' is 's'.
's' inserted within 'nets' is 'NESTS'.
'from' acts as a link.
(Other definitions for nests that I've seen before include "Bird houses" , "Structures for laying eggs" , "Eyries" , "Cosy secluded retreats" , "Tables made to fit closely together" .)