Disorderly actors are plastered (9)
I believe the answer is:
roughcast
'are plastered' is the definition.
(plastered with roughcast plaster)
'disorderly actors' is the wordplay.
'disorderly' becomes 'rough' (I can't justify this - if you can you should give a lot more credence to this answer).
'actors' becomes 'cast' (group of actors).
'rough'+'cast'='ROUGHCAST'
Can you help me to learn more?
(Other definitions for roughcast that I've seen before include "outdoor coat" , "Pebbled surface of wall" , "may use it to get supporters plastered" , "Superficial application" , "often seen plastered outside" .)