Rebuff young girl accepting union work relating to marriage (7)

I believe the answer is:

spousal

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'to marriage' is the definition.
(I've seen this before)

'rebuff young girl accepting union work' is the wordplay.
'rebuff' says the letters should be written in reverse (I've seen 'rebuffed' mean this).
'young girl' becomes 'lass' (synonyms).
'accepting' indicates putting letters inside (inserted letters are accepted).
'union' becomes 'U' (common abbreviation as in 'Trades Union Congress').
'work' becomes 'op' (abbreviation for opus).
'u'+'op'='uop'
'lass' placed around 'uop' is 'lasuops'.
'lasuops' back-to-front is 'SPOUSAL'.

'relating' acts as a link.
This may not be correct. It may belong to another bit of the clue.

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(Another definition for spousal that I've seen is " Relating to a marriage partner".)

I've seen this clue in The Irish Times.

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