Be told twice to voice your approval (4,4)
I believe the answer is:
hear hear
'approval' is the definition.
(I have seen 'express approval' mean 'hear hear' so perhaps 'approval' could also mean 'hear hear')
'be told twice' is the wordplay.
'be told' becomes 'hear' (I've seen this in another clue).
'twice' says to double the letters.
'hear' duplicated is 'HEAR HEAR'.
'to voice your' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for hear hear that I've seen before include "Jolly good!" , "Exclamation of approval" , "Listen, listen - it's approval" , "express approval" , "That's right" .)