Circus gymnast (7)
I believe the answer is:
acrobat
'circus gymnast' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for acrobat that I've seen before include "Performer going head over heels?" , "Performer of great agility and coordination" , "circus artiste" , "Taco bar (anag.)" , "User of five ac" .)