More Artex plastered (5)
I believe the answer is:
extra
'more' is the definition.
(I've seen this in other clues)
'artex plastered' is the wordplay.
'plastered' indicates anagramming the letters (plastered can informally mean drunk).
'artex' with letters rearranged gives 'EXTRA'.
(Other definitions for extra that I've seen before include "Not a hit certainly" , "There's more" , "Bit actor in film" , "Bit actor in movie's crowd scenes" , "23 player?" .)