One of those from the stage heard by the audience is put away
I believe the answer is:
set aside
'one of those from the stage heard by the audience' is the definition.
I can't tell whether this definition defines the answer.
'put away' is the wordplay.
'put' becomes 'set' (setting is a kind of putting).
'away' becomes 'aside' ('aside' can be a synonym of 'away'**).
'set'+'aside'='SET-ASIDE'
'is' is the link.
Can you help me to learn more?
(Other definitions for set aside that I've seen before include "Discount" , "Policy for leaving land alone" , "Reserve or put away" , "The policy of taking land out of production to reduce crop surplus" , "Fallow" .)