21 across
Bow
and
scrape
while
retreating
to
some
extent
(3)
Bow and scrape while retreating to some extent (3)
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The definition is at the beginning of the clue.
How the clue works
Bow is the definition, as an arc is a curved shape. The letters CRA sit hidden inside "s-CRA-pe", and "retreating" tells you to reverse them, turning CRA into ARC.