Bowled, completely smothering fine stroke (9)
I believe the answer is:
butterfly
'stroke' is the definition.
(type of swimming stroke)
'bowled completely smothering fine' is the wordplay.
'bowled' becomes 'b' (cricket abbreviation).
'completely' becomes 'utterly' ('utterly' can be a synonym of 'completely'**).
'smothering' means one lot of letters goes inside another.
'fine' becomes 'f' (abbreviation).
'utterly' going around 'f' is 'utterfly'.
'b'+'utterfly'='BUTTERFLY'
(Other definitions for butterfly that I've seen before include "Insect; flighty person" , "Lepidopterous insect" , "Beautiful insect and swimming stroke" , "Swimming stroke - sort of net, kiss or screw" , "Skipper for instance" .)