Apology for a dance (6,2)
I believe the answer is:
excuse me
I believe this is a double definition.
'apology' is the first definition.
(I've seen this before)
'dance' is the second definition.
(I've seen this before)
'for a' is the link.
(Other definitions for excuse me that I've seen before include "Sort of dance - apology" , "Steps" , "said to be attention-seeking?" , "interrupting dance" , "What one's clumsy partner might say" .)