Current tour without upper-class thespian (5)
I believe the answer is:
actor
'thespian' is the definition.
(synonyms)
'current tour without upper-class' is the wordplay.
'current' becomes 'ac' (alternating current).
'without' is a deletion indicator.
'upper class' becomes 'u' (as in U- and non-U speech).
'tour' with 'u' taken away is 'tor'.
'ac'+'tor'='ACTOR'
(Other definitions for actor that I've seen before include "I pretend" , "Croat (anag.)" , "Theatre player" , "Player - performer" , "Film star" .)