Crossword Genius

Resolve mainly intact, yet must be broken (8)

Ross

I believe the answer is:

tenacity

'resolve' is the definition.
(tenacity is a kind of resolve)

'mainly intact yet must be broken' is the wordplay.
'mainly' means to remove the last letter.
'must be broken' is an anagram indicator.
'intact'+'yet'='intactyet'
'intactyet' with its last letter removed is 'intactye'.
'intactye' is an anagram of 'TENACITY'.

(Other definitions for tenacity that I've seen before include "Firmness of hold" , "Dogged resolve" , "Firm grasp" , "Persistent determination, doggedness" , "Perseverance, doggedness" .)

I've seen this clue in The Telegraph.
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