Crossword Genius

As one who's often scored, ex-Chelsea star's dropped a line about period of sexual activity (4,6)

Ross

I believe the answer is:

john rutter

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'as one who's often scored ex-chelsea star's dropped a line about period' is the definition.
I know nothing about this answer so I can't tell whether this works.

'of sexual activity' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
'activity' could be 'rut' (rut is a kind of activity) and 'rut' is located in the answer.
This explanation may well be incorrect...

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I've seen this clue in the Independent.
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