The rampant animal does detract from the beauty (3)
I believe the answer is:
mar
'detract from the beauty' is the definition.
I can't judge whether this defines the answer.
'the rampant animal' is the wordplay.
'the rampant' shows that the letters should be reversed in order (rampant can mean rearing).
'animal' becomes 'ram' (a male sheep).
'ram' backwards is 'MAR'.
'does' acts as a link.
Can you help me to learn more?
(Other definitions for mar that I've seen before include "wreck" , "Oh dear!" , "'Impair, spoil (3)'" , "hurt" , "Spoil something" .)