22 across
Apply
pressure
about
ten
to
three,
say?
As
long
as
it
takes
(8)
Apply pressure about ten to three, say? As long as it takes (8)
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The definition is at the end of the clue.
How the clue works
DUN means to apply pressure (for payment), and it's placed around RATIO — since "ten to three" is an example of a ratio (the "say?" signals "for example"). Splitting DUN around RATIO gives DU-RATIO-N, defined by As long as it takes.