Parts listed discovered for singer, perhaps (7)
I believe the answer is:
artiste
'singer perhaps' is the definition.
(I know that singer is a type of artiste)
'parts listed discovered' is the wordplay.
'parts' becomes 'art' (I am not sure about this - if you are sure you should believe this answer much more).
'discovered' says to take the centre (dis-covered - outer letters removed).
The middle letters of 'listed' are 'iste'.
'art'+'iste'='ARTISTE'
'for' is the link.
(Other definitions for artiste that I've seen before include "A sitter for a performer" , "Theatre performer" , "One entertaining" , "Person playing" , "Trouper" .)