Extraordinary final set blows up (8)

I believe the answer is:

inflates

'blows up' is the definition.
('inflate' can be a synonym of 'blow up')

'extraordinary final set' is the wordplay.
'extraordinary' indicates an anagram.
'final'+'set'='finalset'
'finalset' is an anagram of 'INFLATES'.

(Other definitions for inflates that I've seen before include "Blows up" , "Exaggerates" .)

I've seen this clue in The Irish Times.

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