Mime’s cheek to droop in the auditorium (3-5)
I believe the answer is:
lip-synch
'droop in the auditorium' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'mime's cheek' is the wordplay.
'mime' becomes 'lipsync' (to lip-sync is to mime along to a song).
'cheek' becomes 'h' (I can't justify this - if you can you should believe this answer much more).
'lipsync'+'h'='LIP-SYNCH'
'to' is the link.
Can you help me to learn more?
(Other definitions for lip-synch that I've seen before include "Pretend to be singing by mouthing the words" , "Mouth pre-recorded words, eg on film" , "Speak to a pre-recorded soundtrack" .)