Crossword Genius

Union in which Labour's involvement is soon expected? (7,7)

Ross

I believe the answer is:

shotgun wedding

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

'in which labour's involvement is soon expected?' is the definition.
The definition suggests a singular noun which matches the answer.

'union' is the wordplay.
I cannot quite understand how this works, but
'union' could be 'wedding' (I've seen this in another clue) and 'wedding' is present in the answer.
The remaining letters 'shotgun' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for shotgun wedding that I've seen is " Matrimony under duress".)

I've seen this clue in The Times.
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