Attention given to extremely listless noblemen (5)
I believe the answer is:
earls
'noblemen' is the definition.
(earl is a kind of nobleman)
'attention given to extremely listless' is the wordplay.
'attention' becomes 'ear' (ear is a kind of attention).
'given to' says to put letters next to each other.
'extremely' suggests removing the centre.
'listless' with its middle taken out is 'ls'.
'ear'+'ls'='EARLS'
(Other definitions for earls that I've seen before include "Lear's out for the flight of the nobility" , "members of the House of Lords" , "counts" , "Noblemen (with a Court?)" , "Peers of the realm" .)