Bombproof quality insulating regulator (6)
I believe the answer is:
ofqual
'regulator' is the definition.
(exams regulator for England)
'bombproof quality insulating' is the wordplay.
'insulating' says the answer is hidden in the clue (the clue covers up or insulates the answer).
'OFQUAL' is hidden within 'bombproof quality'.
I've seen this clue in The Independent.
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