Yuletide snacks head wrapped in boxes (9)
I believe the answer is:
chestnuts
'yuletide snacks' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being plural nouns.
Maybe you can see an association between them that I don't see?
'head wrapped in boxes' is the wordplay.
'head' becomes 'nut' (informal term for somebody's head).
'wrapped in' indicates putting letters inside.
'boxes' becomes 'chests' (chest is a kind of box).
'nut' placed inside 'chests' is 'CHESTNUTS'.
Can you help me to learn more?
(Other definitions for chestnuts that I've seen before include "Common tree-fruits, sometimes roasted" , "horses" , "often retold stories" , "Tree fruits called conkers - some are edible" .)