Steal game (5)
I believe the answer is:
poach
'steal game' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for poach that I've seen before include "Appropriate" , "Steal (game) - cook (eggs)" , "Acquire illegally" , "Cook (an egg) in water" , "Take game illegally from land or water" .)