10 across
Equerry’s
rump
plastered
in
red
sauce
(4)
Equerry’s rump plastered in red sauce (4)
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The definition is at the end of the clue.
How the clue works
The definition is sauce — think mayonnaise shortened to four letters. You take red as MAO (the communist leader), then stuff the "rump" of Equerry (that's the final letter, Y) inside it to get MA-Y-O.