Holiday season, for short (4)
I believe the answer is:
xmas
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">holiday season for short</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for xmas that I've seen before include "Yuletide" , "Brief version of the Nativity, beginning with Greek letter" , "annual holiday" , "Short for Christmas" , "Christmas (informal)" .)