Crossword Genius

Who's that MP who reportedly went for a nightly swim dad? (3,8)

Ross

I believe the answer is:

lee anderson

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

'who's that mp who reportedly went' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'a nightly swim dad?' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
This explanation may well be incorrect...

'for' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.
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