Ideal fellow tries diverting river in May (6,5)

I believe the answer is:

mister right

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

'ideal fellow' is the definition.
I know nothing about this answer so I can't judge whether this works.

'tries diverting river in may' is the wordplay.
'diverting' indicates anagramming the letters (letters diverted elsewhere).
'river' becomes 'r' (abbreviation for river).
'in' indicates putting letters inside.
'may' becomes 'might' ('may' and 'might' are similar in meaning).
'tries' anagrammed gives 'ister'.
'ister'+'r'='isterr'
'isterr' placed inside 'might' is 'MISTER RIGHT'.

Can you help me to learn more?

I've seen this clue in The Daily Express.

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.