Steal and cook (5)
I believe the answer is:
poach
I believe this clue is a double definition.
'steal' is the first definition.
(thesaurus)
'cook' is the second definition.
(poaching is a kind of cooking)
'and' is the link.
(Other definitions for poach that I've seen before include "Cook in boiling liquid - steal game" , "Cook; hunt illegally" , "Cook in a simmering liquid" , "Steal (game) - cook (eggs)" , "Cook (an egg) in water" .)