Avid listener for example back inside (5)
I believe the answer is:
eager
'avid' is the definition.
(I've seen this before)
'listener for example back inside' is the wordplay.
'listener' becomes 'ear' (I've seen this before).
'for example' becomes 'eg' ('e.g.' can be a synonym of 'for example').
'back' shows that the letters should be reversed in order.
'inside' means one lot of letters goes inside another.
'eg' in reverse letter order is 'ge'.
'ear' going around 'ge' is 'EAGER'.
(Other definitions for eager that I've seen before include "Agree (anag.)" , "Ardent" , "Showing keen interest" , "really keen" , "Desperate" .)