Thespians (6)
I believe the answer is:
actors
'thespians' is the definition.
('actor' can be a synonym of 'thespian')
This is all the clue.
(Other definitions for actors that I've seen before include "The Gleeson boys, say" , "eg 9 & 11 across" , "Theatrical performers" , "They 23 down" , "Thespians" .)