They cultivate one who's already married before other fellows (10)

I believe the answer is:

husbandmen

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'they cultivate one who's already married before' is the definition.
The definition suggests an adverb but the answer is not.

'other fellows' is the wordplay.
'other' becomes 'husband' (I can't explain this - if you can you should believe this answer much more).
'fellows' becomes 'men' (fellow can mean a man).
'husband'+'men'='HUSBANDMEN'

Can you help me to learn more?

I've seen this clue in The Irish News.

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