Greek character with stick reveals sharp double bend (7)
I believe the answer is:
chicane
'sharp double bend' is the definition.
(I've seen this before)
'greek character with stick' is the wordplay.
'greek character' becomes 'chi' (letter from the Greek alphabet).
'with' is a charade indicator (letters next to each other).
'stick' becomes 'cane' (cane is a kind of stick).
'chi'+'cane'='CHICANE'
'reveals' acts as a link.
(Other definitions for chicane that I've seen before include "Sharp double bend on a racetrack" , "Trick" , "Sharp race track bends" , "Series of bends on a motor racing circuit" , "Sharp double bend as obstacle" .)