Crossword Genius

As happens regularly, visits one (5,5)

Ross

I believe the answer is:

comes round

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'visits one' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot see how one could define the other.

'as happens regularly' is the wordplay.
I cannot quite see how this works, but
'happens' could be 'comes' (coming is a kind of happening) and 'comes' is found in the answer.
The remaining letters 'round' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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