Crossword Genius

100% determined (4,3)

Ross

I believe the answer is:

dead set

(Other definitions for dead set that I've seen before include "A determined attack, sounds moribund" , "Resolute -- sedated (anag)" , "A determined attack - from moribund group?" , "Absolutely - sedated (anag)" , "A determined attack - from extinct group?" .)

I've seen this clue in The Guardian.
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