A small part of Christmas scene last to receive credit (7)
I believe the answer is:
ascribe
'credit' is the definition.
(I've seen this before)
'a small part of christmas scene last to receive' is the wordplay.
'part of' says to take the initial letters (I've seen 'part' mean this).
'christmas scene' becomes 'crib' (I've seen this before).
'last to' says to take the final letters.
The initial letter of 'small' is 's'.
The last letter of 'receive' is 'e'.
'a'+'s'+'crib'+'e'='ASCRIBE'
(Other definitions for ascribe that I've seen before include "Attribute in Brescia" , "Attribute (something to a cause)" , "Attribute to specified source or cause" , "'Impute, assign (7)'" , "Attribute or credit to" .)