Mistake gets one right animal (7)
I believe the answer is:
giraffe
'animal' is the definition.
(I've seen this before)
'mistake gets one right' is the wordplay.
'mistake' becomes 'gaffe' (a gaffe is a mistake or error).
'gets' indicates putting letters inside (gets can mean captures or absorbs).
'one' becomes 'I' (Roman numeral).
'right' becomes 'r' (common abbreviation).
'i'+'r'='ir'
'gaffe' placed around 'ir' is 'GIRAFFE'.
(Other definitions for giraffe that I've seen before include "The animal might fear fig" , "that's beastly" , "Sixteen, mostly neck" , "Tallest land animal" , "Tall quadruped" .)