Union forced to raise legitimate issue (7,7)
I believe the answer is:
shotgun wedding
'raise legitimate issue' is the definition.
The definition suggests a singular noun which matches the answer.
'union forced' is the wordplay.
I cannot really see how this works, but
'union' could be 'wedding' (I've seen this in another clue) and 'wedding' is found within the answer.
The remaining letters 'shotgun' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Another definition for shotgun wedding that I've seen is " Matrimony under duress".)