5 down
Plain
type
of
sandwich
has
a
French
filling
(5)
Plain type of sandwich has a French filling (5)
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The definition is at the beginning of the clue.
How the clue works
Take BLT, your classic sandwich, and stuff something inside it for the filling — that's UN, the French word for "a". Slot UN inside BLT and you get the answer, which is the definition, Plain, meaning blunt or direct in manner.