Ceremonial instruments used in Lysistrata (6)
I believe the answer is:
sistra
'ceremonial instruments' is the definition.
(plural of sistrum, ancient Egyptian instrument)
'in lysistrata' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SISTRA' is hidden within 'lysistrata'.
'used' acts as a link.
(Other definitions for sistra that I've seen before include "instruments" , "Ancient Egyptian wire rattles" .)