A lawyer set free any otter (8)
I believe the answer is:
attorney
'a lawyer' is the definition.
(synonyms)
'set free any otter' is the wordplay.
'set free' is an anagram indicator (the letters are free to move around).
'any'+'otter'='anyotter'
'anyotter' with letters rearranged gives 'ATTORNEY'.
(Other definitions for attorney that I've seen before include "brief" , "Person legally appointed to act for another" , "Legal professional" , "Lawman" , "profession" .)