Eponymous hero demonstrates only one trick, perhaps (4)
I believe the answer is:
pony
'trick perhaps' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'eponymous hero demonstrates only one' is the wordplay.
'PONY' is hidden within the letters.
However, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for pony that I've seen before include "Small breed of horse" , "Horse (worth PS25?)" , "Twenty-five pounds; small horse" , "Horse (worth GBP25?)" , "(girl's pet, perhaps)" .)