One who'd break for dance (7)
I believe the answer is:
hoedown
'for dance' is the definition.
(I've seen this before)
'one who'd break' is the wordplay.
'break' indicates an anagram.
'one'+'whod'='onewhod'
'onewhod' is an anagram of 'HOEDOWN'.
(Other definitions for hoedown that I've seen before include "Boisterous American folk dance" , "Square 20" , "American country dance" , "Woodhen (anag.)" , "Square dance" .)