One has a right to make a mistake about the animal (7)
I believe the answer is:
giraffe
'the animal' is the definition.
(I've seen this before)
'one has a right to make a mistake about' is the wordplay.
'one' becomes 'i' (Roman numeral).
'has' means one lot of letters go next to another.
'a right' becomes 'r' (common abbreviation).
'to make a mistake' becomes 'gaffe' (I can't explain this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
'i'+'r'='ir'
'ir' put within 'gaffe' is 'GIRAFFE'.
Can you help me to learn more?
(Other definitions for giraffe that I've seen before include "Tallest beast" , "Lofty browser's" , "Fire fag at the animal" , "Tall creature" , "Long-necked ruminant" .)