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When Henry joins Oscar, it's a good sign (4)

Ross

I believe the answer is:

halo

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

'a good sign' is the definition.
(I've seen this in another clue)

'when henry joins oscar' is the wordplay.
I cannot really understand how this works, but
'henry' could be 'hal' (short for Henry) and 'hal' is found in the answer.
'oscar' could be 'o' (phonetic alphabet: alpha, bravo, charlie etc.) and 'o' is found in the answer.
No letters remain.
This explanation may well be incorrect...

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for halo that I've seen before include "Glowing ring (around saint's head)" , "Ring round head of saint" , "Saint's headlight?" , "Circle over a saint" , "Disc of light" .)

I've seen this clue in the Evening Standard.
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