Leapers in a Christmas song (5)
I believe the answer is:
lords
'leapers in a christmas song' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lords that I've seen before include "Parliamentary house" , "house in London" , "British upper house" , "Peers at the cricket ground" , "MCC HQ" .)