Dance with old soldiers (7)
I believe the answer is:
lancers
This might be a double definition.
'dance' is the first definition.
(lancers is a kind of dance)
'old soldiers' is the second definition.
'lancers' can be an answer for 'soldiers' (lancer is a kind of soldier). I'm not sure about the 'old' bit.
'with' is the link.
Can you help me to learn more?
(Other definitions for lancers that I've seen before include "Cavalrymen - dance" , "Cavalry soldiers; dance" , "Old regiment; dance" , "Quadrille for eight/sixteen pairs" , "Soldiers with spears on horseback" .)