Lone, relaxed Christmas (4)
I believe the answer is:
noel
'christmas' is the definition.
(Noel can mean Christmas)
'lone relaxed' is the wordplay.
'relaxed' indicates anagramming the letters.
'lone' is an anagram of 'NOEL'.
(Other definitions for noel that I've seen before include "Girl - boy - Christmas" , "Coward who wrote and acted, d. 1973" , "A lone Christmas in France" , "Sir - - Coward" , "A lone French Christmas" .)