Dance with couple on stage (3-4)
I believe the answer is:
two-step
'dance' is the definition.
(I know that two-step is a more specific form of the action dance)
'couple on stage' is the wordplay.
'couple' becomes 'two' (two people or things).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'stage' becomes 'step' (as in a step or stage of a process).
'two'+'step'='TWO-STEP'
'with' is the link.
(Other definitions for two-step that I've seen before include "Gliding dance" , "Old-time dance in duple time" , "Dance, maybe military" , "Dance (not pas de deux!)" , "Sot wept doing ballroom dance" .)