Is this hotter than a smoking jacket? (6)

I believe the answer is:

blazer

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'smoking jacket?' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for blazer that I've seen before include "Summer sporting jacket" , "School jacket (on fire?)" , "Light single-breasted (school or club) jacket" , "First to trail" , "Man's jacket, sounds hot" .)

I've seen this clue in The Sun and The Times.

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