Value greatly as singer? (7)
I believe the answer is:
cherish
'value' is the definition.
(thesaurus)
'greatly as singer?' is the wordplay.
I cannot really see how this works, but
'singer?' could be 'cher' (American singer) and 'cher' is located in the answer.
The remaining letters 'ish' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cherish that I've seen before include "Hold dear -- he's rich (anag)" , "Hold dear, treasure" , "Protect and treat with affection" , "Love" , "Hold dear, be fond of" .)