Agile entertainer (7)
I believe the answer is:
acrobat
'agile entertainer' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for acrobat that I've seen before include "Agile entertainer" , "Gymnastic performer" , "Circus star" , "Circus entertainer" , "Tightrope-walker" .)