Complete hour to reconstruct temperature-sensing device (12)
I believe the answer is:
thermocouple
'temperature-sensing device' is the definition.
'complete hour to reconstruct' is the wordplay.
'to reconstruct' indicates an anagram (I've seen 'reconstructed' mean this).
'complete'+'hour'='completehour'
'completehour' anagrammed gives 'THERMOCOUPLE'.
(Another definition for thermocouple that I've seen is " It measures heat".)
I've seen this clue in The Times.
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