Bread with a filling (informally) (6)

I believe the answer is:

sarnie

(Other definitions for sarnie that I've seen before include "Familiar form of snack" , "Sandwich (slang)" , "Popular bread-based snack (colloq)" , "Bread and filling snack (informal)" , "Two slices of bread with a filling" .)

I've seen this clue in The Guardian.

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