Crossword Genius

Regularly play sport, coming first like clockwork (10)

Ross

I believe the answer is:

swimmingly

'like clockwork' is the definition.
(thesaurus)

'regularly play sport coming first' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'sport' becomes 'swimming' (swimming is a kind of sport**).
'coming first' says to put letters next to each other.
The alternating letters of 'play' are 'ly'.
'ly' put after 'swimming' is 'SWIMMINGLY'.

I've seen this clue in The Guardian.
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