Quiet performance in ballroom I'm enjoying (4)
I believe the answer is:
mime
'quiet performance' is the definition.
(a mime performs without speaking)
'in ballroom i'm enjoying' is the wordplay.
'in' indicates a hidden word.
'MIME' is hidden within 'ballroom im enjoying'.
(Other definitions for mime that I've seen before include "Wagnerian role?" , "Play without dialogue" , "Acting dumb?" , "Dumb-show" , "Art of the late Marcel Marceau" .)