Slow movement dedicated to a nerd and god's girlfriend (6)
I believe the answer is:
adagio
'slow movement' is the definition.
(slow musical movement)
'dedicated to a nerd and god's girlfriend' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'god' could be 'd' (abbreviation in various Latin phrases) and 'd' is found in the answer.
The remaining letters 'agio' 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 adagio that I've seen before include "(A movement) to be played slowly" , "In slow time (mus.)" , "Slow musical passage" , "Slowly and graceful, in music" , "going slowly in work" .)