Wedding attendant looks after husband (9)

I believe the answer is:

groomsman

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'wedding attendant' is the definition.
(I've seen this in another clue)

'looks after husband' is the wordplay.
'looks' becomes 'grooms' (I can't explain this - if you can you should believe this answer much more).
'after' is a charade indicator (letters next to each other).
'husband' becomes 'man' (a married man).
'grooms'+'man'='GROOMSMAN'

Can you help me to learn more?

(Another definition for groomsman that I've seen is " Male wedding attendant".)

I've seen this clue in The Irish Times.

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