Dealer working with animal fat taking tip off animal trainer (7)
I believe the answer is:
handler
'animal trainer' is the definition.
(synonyms)
'dealer working with animal fat taking tip off' is the wordplay.
I cannot quite see how this works, but
'with' could be 'and' and 'and' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for handler that I've seen before include "Boxer's trainer" , "found by police dog?" , "Person in charge of police dogs, boxers or spies" , "Someone who directs the activities of a spy" , "Police officer in charge of a dog" .)