Determined, Blair acted recklessly (10)
I believe the answer is:
calibrated
'determined' is the definition.
(to calibrate is to set or determine)
'blair acted recklessly' is the wordplay.
'recklessly' indicates anagramming the letters.
'blair'+'acted'='blairacted'
'blairacted' is an anagram of 'CALIBRATED'.
I've seen this clue in The Guardian.
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