Who'll do supper for Meryl's shows? (9)
I believe the answer is:
performer
'who'll do' is the definition.
(someone who will do or perform something)
'supper for meryl's shows?' is the wordplay.
'shows?' indicates the answer is hidden within the clue (I've seen 'shows' mean this).
'PERFORMER' is hidden in the letters of 'supper for meryls'.
(Other definitions for performer that I've seen before include "artist" , "Artiste" , "Eg 9 [ACTRESS]" , "star?" , "clown possibly" .)