Entertainer who’s first rate all round, potentially (7)
I believe the answer is:
artiste
'entertainer' is the definition.
(artiste is a kind of entertainer)
'first rate all round potentially' is the wordplay.
I cannot quite see how this works, but
'first' could be 'ist' and 'ist' is present in the answer.
an anagram of 'rate' is 'arte' which is present in the remaining letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'who's' is the link.
Can you help me to learn more?
(Other definitions for artiste that I've seen before include "nightclub entertainer?" , "Trouper" , "'Public performer, dancer or singer (7)'" , "Person playing" , "A sitter for creative person" .)