One excited by laptop for Christmas (4)
I believe the answer is:
noel
'christmas' is the definition.
(Noel can mean Christmas)
'one excited by laptop' is the wordplay.
'excited' indicates anagramming the letters.
'by' is a charade indicator (letters next to each other).
'laptop' becomes 'l' (top of the word 'lap').
'one' is an anagram of 'noe'.
'noe'+'l'='NOEL'
'for' is the link.
(Other definitions for noel that I've seen before include "Coward for one" , "Christmastime" , "A lone Christmas in France" , "Festive season" , "A lone French Christmas" .)