Acrobat’s bar (7)
I believe the answer is:
trapeze
'acrobat's bar' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trapeze that I've seen before include "Circus feature" , "Acrobatic equipment" , "Circus acrobatsO swing" , "Big top swing" , "swingers' bar" .)