Married in Polish before a dance (5)
I believe the answer is:
rumba
'dance' is the definition.
(rumba is a kind of dance)
'married in polish before a' is the wordplay.
'married' becomes 'm'.
'in' is an insertion indicator.
'polish' becomes 'rub' (polish meaning rub to make shiny).
'before' says to put letters next to each other.
'm' put within 'rub' is 'rumb'.
'rumb'+'a'='RUMBA'
(Other definitions for rumba that I've seen before include "one's on the floor for it" , "Umbra (anag)" , "South American dance" , "Dance originating in Cuba" , "Latin beat" .)