In Pwllheli one's seen female footballer (7)
I believe the answer is:
lioness
'female footballer' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'in pwllheli one's seen' is the wordplay.
'in' indicates the answer is hidden within the clue.
'LIONESS' is hidden in the letters of 'pwllheli ones seen'.
Can you help me to learn more?
(Other definitions for lioness that I've seen before include "Fierce female feline" , "Queen of beasts?" , "Brave woman" , "She may have pride" , "predatory female'" .)