Monsieur visiting his dear one who perhaps arranged their meeting (7)

I believe the answer is:

matcher

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

'dear one who perhaps arranged their meeting' is the definition.
The definition suggests a singular noun which matches the answer.

'monsieur visiting his' is the wordplay.
'monsieur' becomes 'm' (French abbreviation - like Mr for Mister).
'visiting' becomes 'at'.
'his' becomes 'cher' (I can't justify this - if you can you should give a lot more credence to this answer).
'm'+'at'+'cher'='MATCHER'

Can you help me to learn more?

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.