Noblemen attending court in London? (5)
I believe the answer is:
earls
'noblemen' is the definition.
(earl is a kind of nobleman)
'attending court in london?' is the wordplay.
'attending' becomes 'ear' (ear is a kind of attending).
'court in london?' becomes 'ls' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ear'+'ls'='EARLS'
Can you help me to learn more?
(Other definitions for earls that I've seen before include "counts" , "London exhibition centre" , "Nobles" , "They're below marquess and above viscount" , "members of the House of Lords" .)