A bit of prestige rarely harms a cat! (5)
I believe the answer is:
tiger
'a cat' is the definition.
(I know that tiger is a type of cat)
'a bit of prestige rarely harms' is the wordplay.
'a bit of' indicates the answer is hidden within the clue.
'TIGER' can be found hidden inside 'prestige rarely harms'.
(Other definitions for tiger that I've seen before include "Ferocious cat" , "Dynamo" , "he got his stripes" , "Large wildcat poetically burning bright" , "Large wild cat" .)