Part of song about Egyptian god (6)
I believe the answer is:
chorus
'part of song' is the definition.
(I know that chorus is part of song)
'about egyptian god' is the wordplay.
'about' becomes 'c' (abbreviation for circa).
'egyptian god' becomes 'horus' (Horus is an example).
'c'+'horus'='CHORUS'
(Other definitions for chorus that I've seen before include "Sing together" , "Band of singers and dancers" , "Song's repeated part" , "It joins a soloist in parts of songs" , "Speak in unison" .)