Firmness of purpose (7)

I think it could be either:

Which length description are you looking for?:

resolve

'firmness of purpose' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for resolve that I've seen before include "Determine firmly" , "Determine with conviction" , "Fix" , "Be determined" , "Settle, conclude" .)

I've seen this clue in The Telegraph, The Times, the Sydney Morning Herald, the Wall Street Journal, The Irish Times, The Guardian and The Independent.

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