Men getting out of manhole with divine head light (4)
'light' is the definition.
(halo is a kind of light)
'men getting out of manhole with divine head' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'hal' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for halo that I've seen before include "Angelic aura", "Circle painted over saint's head", "Ring of saintliness", "Nimbus", "Band of light".)