Crossword Genius

Four in romcom linked with sexual celebration (7,4,8)

Ross

I believe the answer is:

notting hill carnival

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

'four' is the definition.
Both the definition and answer are adjectives.
Perhaps they are linked in a way I don't understand?

'in romcom linked with sexual celebration' is the wordplay.
I cannot really understand how this works, but
'in' is found in the answer.
'celebration' could be 'carnival' (carnival is a kind of celebration) and 'carnival' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for notting hill carnival that I've seen is " Annual west London event".)

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