20 down
Determination
to
relax
(7)
Determination to relax (7)
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The whole clue is the definition (& lit or double definition).
How the clue works
The definition is Determination — but then so is relax. RESOLVE does double duty here: it means firm determination, and it also means to relax or break down (think of a swelling that resolves). Two completely separate meanings, one word.