Animal makes mistake about endless fire (7)
I believe the answer is:
giraffe
'animal' is the definition.
(I know that giraffe is a type of animal)
'mistake about endless fire' is the wordplay.
'mistake' becomes 'gaffe' (a gaffe is a mistake or error).
'about' means one lot of letters goes inside another.
'endless' indicates the central letters.
The central letters of 'fire' are 'ir'.
'gaffe' placed around 'ir' is 'GIRAFFE'.
'makes' acts as a link.
(Other definitions for giraffe that I've seen before include "Lofty browser's" , "Large African mammal" , "Long-necked browser" , "Sixteen, mostly neck" , "Tallest beast" .)