Rescue large wild bears (7)
I believe the answer is:
salvage
'rescue' is the definition.
(I know that salvage is a type of rescue)
'large wild bears' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'wild' becomes 'savage' (synonyms).
'bears' means one lot of letters goes inside another (some letters carry or bear others).
'l' going inside 'savage' is 'SALVAGE'.
(Other definitions for salvage that I've seen before include "Save - junk" , "Save from a sinking ship" , "Retrieve goods from wrecked ship" , "Rescue of a damaged ship or its cargo" , "Recover discarded material" .)