Blows up, as final set botched (8)
I believe the answer is:
inflates
'blows up' is the definition.
('inflate' can be a synonym of 'blow up')
'final set botched' is the wordplay.
'botched' is an anagram indicator.
'final'+'set'='finalset'
'finalset' anagrammed gives 'INFLATES'.
'as' acts as a link.
(Other definitions for inflates that I've seen before include "Blows up" , "Exaggerates" .)