Possibly Audrey Hepburn's wonderful short hair (7)
I believe the answer is:
actress
'possibly audrey hepburn's' is the definition.
I can't judge whether this defines the answer.
'wonderful short hair' is the wordplay.
'wonderful' becomes 'ace' (ace can informally mean very good).
'short' means to remove the last letter.
'hair' becomes 'tress' (tress is a kind of hair).
'ace' with its final letter removed is 'ac'.
'ac'+'tress'='ACTRESS'
Can you help me to learn more?
(Other definitions for actress that I've seen before include "One on stage" , "Female stage-player" , "Recasts (anag) - performer" , "Female in plays/films" , "Terry, say" .)