Snack stuffed in ears! (6)
I believe the answer is:
sarnie
'snack' is the definition.
(informal term for a sandwich)
'stuffed in ears' is the wordplay.
'stuffed' indicates an anagram.
'in'+'ears'='inears'
'inears' anagrammed gives 'SARNIE'.
(Other definitions for sarnie that I've seen before include "Familiar form of snack" , "no classy fare" , "Sandwich (informal)" , "Sandwich (slang)" , "Two slices of bread with a filling" .)