In venerable circles, Henry gets so upset (5)

I believe the answer is:

halos

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

'in venerable circles' is the definition.
The definition and answer can be both shapes as well as being plural nouns.
Maybe you can see an association between them that I can't see?

'henry gets so upset' is the wordplay.
'henry' becomes 'hal' (short for Henry).
'gets' is a charade indicator (letters next to each other).
'upset' is a reversal indicator.
'so' backwards is 'os'.
'hal'+'os'='HALOS'

Can you help me to learn more?

(Another definition for halos that I've seen is " Saintly emblems".)

I've seen this clue in the Evening Standard.

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