As a musician, is he a good cake decorator? (5)
I believe the answer is:
piper
'cake decorator?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'as a musician is he a good' is the wordplay.
I cannot really understand how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is present in the answer.
'good' could be 'pi' (old-fashioned term for pious) and 'pi' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for piper that I've seen before include "Military musician" , "Bagpipes player" , "Musician (who gets paid?)" , "English painter and stained glass designer, d. 1992" , "Musician (paid for a tune?)" .)