Mocking actors in Indian dress, beginning to chant (9)
I believe the answer is:
sarcastic
'mocking' is the definition.
(I've seen this before)
'actors in indian dress beginning to chant' is the wordplay.
'actors' becomes 'cast' (I've seen this before).
'in' means one lot of letters goes inside another.
'indian dress' becomes 'sari' (I've seen this before).
'beginning to' says to take the initial letters.
The initial letter of 'chant' is 'c'.
'cast' going within 'sari' is 'sarcasti'.
'sarcasti'+'c'='SARCASTIC'
(Other definitions for sarcastic that I've seen before include "Barbed, biting" , "Derisive" , "Expressing ridicule, contempt, maybe irony" , "Cruelly ironical" , "Using scornful language" .)