Runner in his kit (3)

I believe the answer is:

ski

'runner' is the definition.
(something which 'runs', ie moves quickly on snow)

'in his kit' is the wordplay.
'in' says the answer is hidden in the clue.
'SKI' can be found hidden inside 'his kit'.

(Other definitions for ski that I've seen before include "Journey" , "Piece of sports equipment" , "Snow blade" , "Hit the slopes" , "Type of snow shoe" .)

I've seen this clue in The Sun.

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