A bit of Christmas cheer's unusual around nursery (6)
I believe the answer is:
creche
'nursery' is the definition.
(I've seen this before)
'a bit of christmas cheer's unusual' is the wordplay.
'a bit of' suggests taking the first letters.
'unusual' is an anagram indicator.
The initial letter of 'christmas' is 'c'.
'cheer' is an anagram of 'reche'.
'c'+'reche'='CRECHE'
'around' is the link.
(Other definitions for creche that I've seen before include "A day care baby-minding business" , "Place where infants are cared for" , "Place to leave children" , "A day nursery used by working parents" , "Representation of the nativity scene" .)