Crossword Genius

An overhead light (4)

Ross

I believe the answer is:

halo

I'm a little stuck... Click here to teach me more about this clue!

'an overhead light' is the definition.
(I've seen this in another clue)

'overhead light' is the wordplay.
I cannot really understand how this works, but
'overhead' could be 'o' (head letter of 'over') and 'o' is found within 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 "Sign of holiness" , "Circle over a saint" , "Saint's circle of light" , "Hagiological aura featured in Christian art" , "Aura representing saintliness" .)

I've seen this clue in The Globe and Mail.
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