Noblemen left among listeners (5)
I believe the answer is:
earls
'noblemen' is the definition.
(earl is a kind of nobleman)
'left among listeners' is the wordplay.
'left' becomes 'l' (common abbreviation).
'among' indicates putting letters inside (inserted letters are placed among others).
'listeners' becomes 'ears' (body parts which listen).
'l' placed within 'ears' is 'EARLS'.
(Other definitions for earls that I've seen before include "Noblemen (with a Court?)" , "Nobles" , "London exhibition centre" , "Lear's out for the flight of the nobility" , "counts" .)