Love working like an animal (4)
I believe the answer is:
vole
'an animal' is the definition.
(thesaurus)
'love working' is the wordplay.
'working' is an anagram indicator.
'love' is an anagram of 'VOLE'.
'like' acts as a link.
(Other definitions for vole that I've seen before include "A little rodent" , "River bank rodent" , "Small burrowing animal - love it" , "A small plant-eating rodent - love it" , "creature" .)