Absurd lone Christmas (4)
I believe the answer is:
noel
'christmas' is the definition.
('Noel' can be a synonym of 'christmas')
'absurd lone' is the wordplay.
'absurd' is an anagram indicator.
'lone' is an anagram of 'NOEL'.
(Other definitions for noel that I've seen before include "A lone Christmas in France" , "A lone French Christmas" , "Christmas, esp. in carols; boy's name" , "present time" , "Christmastime" .)