Stroke an insect (9)
I believe the answer is:
butterfly
I believe this is a double definition.
'stroke' is the first definition.
(type of swimming stroke)
'an insect' is the second definition.
(I know that butterfly is a type of lepidopteran)
(Other definitions for butterfly that I've seen before include "Winged insect and swimming stroke" , "noted geisha?" , "Skipper for instance" , "Lepidopterous insect" , "Insect with large, usually brightly coloured, wings" .)