Smart painter regularly showing bends in track (7)
I believe the answer is:
chicane
'bends in track' is the definition.
(pair of bends on a racetrack)
'smart painter regularly' is the wordplay.
'smart' becomes 'chic' (both can mean stylish).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'painter' are 'ane'.
'chic'+'ane'='CHICANE'
'showing' acts as a link.
(Other definitions for chicane that I've seen before include "Series of sharp narrow bends (in motor racing)" , "Double bend obstacle on racing track" , "Series of bends on a motor racing circuit" , "Sharp race track bends" , "Sharp double bend on a racetrack" .)