Listen to everything and hare off? Unacceptable (4,3)
I believe the answer is:
hear out
'listen to everything' is the definition.
(I've seen this before)
'hare off? unacceptable' is the wordplay.
'off?' is an anagram indicator (I've seen 'off' mean this).
'unacceptable' becomes 'out' (I've seen this before).
'hare' with letters rearranged gives 'hear'.
'hear'+'out'='HEAR OUT'
'and' acts as a link.
(Other definitions for hear out that I've seen before include "Take everything in" , "Thoreau (anag)" , "Listen to everything" .)