Listening to Muzak, perhaps (2,4)
I believe the answer is:
on hold
'listening to muzak perhaps' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for on hold that I've seen before include "In abeyance" , "suspended" , "Waiting for connection (telephone)" , "Made to wait (on phone)" , "Postoned, or awaiting reply to phone call" .)