My word for love in marriage is a horny one (7)
I believe the answer is:
unicorn
'my word for love in marriage is a horny one' is the definition.
I can't judge whether this defines the answer.
'my word for love in marriage is a horny one' is the wordplay.
I cannot quite understand how this works, but
'my' could be 'cor' (both are expressions of surprise) and 'cor' is located in the answer.
'in' is found in the answer.
'one' could be 'un' (northern English dialect form of 'one') and 'un' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for unicorn that I've seen before include "Mythical beast like horned horse" , "Fabulous creature" , "Team of three" , "wonder horse" , "Mythical horned equine" .)