Find food for a lifetime (6)
I believe the answer is:
forage
'find food' is the definition.
(I've seen this in another clue)
'for a lifetime' is the wordplay.
'a lifetime' becomes 'age' (I've seen this in another clue).
'for'+'age'='FORAGE'
(Other definitions for forage that I've seen before include "Military raid" , "sort of cap" , "look around" , "Search widely for food" , "Collect food" .)