12 across
Wolf
down
sandwich
with
duck
filling
(4)
Wolf down sandwich with duck filling (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Wolf down — to eat rapidly. For the wordplay, think of a BLT (that's your sandwich) with O stuffed inside it as the filling (duck, as in zero), giving you B-O-LT.