Singers initially rejected God (5)
I believe the answer is:
horus
'god' is the definition.
(Egyptian god)
'singers initially rejected' is the wordplay.
'singers' becomes 'chorus' (I've seen this before).
'initially rejected' means to remove the first letter.
'chorus' with its initial letter taken away is 'HORUS'.
(Other definitions for horus that I've seen before include "Egyptian hawk-headed god" , "Falcon-headed god of ancient Egypt" , "Falcon-headed old Egyptian god" , "Egyptian god of the sun" , "Egyptian sun-god" .)