Lent is wrong for Christmas decoration (6)
I believe the answer is:
tinsel
'christmas decoration' is the definition.
(tinsel is strewn around at Christmas)
'lent is wrong' is the wordplay.
'wrong' indicates an anagram.
'lent'+'is'='lentis'
'lentis' with letters rearranged gives 'TINSEL'.
'for' is the link.
(Other definitions for tinsel that I've seen before include "Inexpensive sparkly stuff" , "Christmas decorations" , "Cheap shiny stuff" , "At Christmas it might be seen" , "superficially attractive" .)