Runner from Smolensk indisposed (3)
I believe the answer is:
ski
'runner' is the definition.
(something which 'runs', ie moves quickly on snow)
'from smolensk indisposed' is the wordplay.
'from' indicates a hidden word.
'SKI' is hidden in the letters of 'smolensk indisposed'.
(Other definitions for ski that I've seen before include "Participate in winter sport" , "Go on snow runners" , "go uphill? Probably not!" , "Winter sport item" , "Piece of sports equipment" .)