19 down
Simple
restaurant’s
gravy
overcomes
resistance
(6)
Simple restaurant’s gravy overcomes resistance (6)
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The definition is at the beginning of the clue.
How the clue works
A simple restaurant is the definition here, and the wordplay is all about gravy. Take BISTO (the famous gravy brand) and have it overcome, or wrap around, R for resistance, so the R lands inside BIST and O. That gives you BIST-R-O, and the whole thing fits Simple restaurant nicely.