Musical conclusion to part of Puerto Rico dance (4)
I believe the answer is:
coda
'musical conclusion' is the definition.
(I've seen this before)
'part of puerto rico dance' is the wordplay.
'part of' says the answer is hidden in the clue.
'CODA' can be found hidden inside 'puerto rico dance'.
'to' acts as a link.
(Other definitions for coda that I've seen before include "bit at the end" , "Ending of musical piece" , "Final part of mus. structure" , "Closing passage of a piece of music" , "finale in Beethoven?" .)