Sir gets wild animal (7)
I believe the answer is:
tigress
'animal' is the definition.
(I've seen this before)
'sir gets wild' is the wordplay.
'wild' is an anagram indicator.
'sir'+'gets'='sirgets'
'sirgets' is an anagram of 'TIGRESS'.
(Other definitions for tigress that I've seen before include "dangerous animal" , "Passionate woman" , "Female striped cat" , "Amazon, say" , "Striped feline female" .)