Stylish and showy when running (7)
I believe the answer is:
dashing
I believe this clue is a triple definition!
'stylish' is the first definition.
(thesaurus)
'and' is a link.
'showy' is the second definition.
(thesaurus)
'when' acts as a link.
'running' is the third definition.
(dashing is a kind of running)
(Other definitions for dashing that I've seen before include "as blade might be" , "Rakish" , "Running; stylish" , "Frustrating; debonair" , "(Of male) stylish, spirited" .)