Listen twice for approval from audience (4,4)
I believe the answer is:
hear hear
'approval from audience' is the definition.
'hear hear' can be an answer for 'approval' (I have seen 'express approval' mean 'hear hear' so perhaps 'approval' could also mean 'hear hear'). I am unsure of the 'from audience' bit.
'listen twice' is the wordplay.
'listen' becomes 'hear' (I've seen this in another clue).
'twice' shows that letters should be duplicated.
'hear' doubled is 'HEAR HEAR'.
'for' is the link.
Can you help me to learn more?
(Other definitions for hear hear that I've seen before include "express approval" , "Agreed" , "Listen, listen - it's approval" , "Jolly good!" , "Well said!" .)