Amazing sunspot due to explode (10)

I believe the answer is:

stupendous

'amazing' is the definition.
(thesaurus)

'sunspot due to explode' is the wordplay.
'to explode' indicates an anagram.
'sunspot'+'due'='sunspotdue'
'sunspotdue' anagrammed gives 'STUPENDOUS'.

(Other definitions for stupendous that I've seen before include "Extremely impressive" , "Astoundingly huge" , "Astounding" , "Phenomenal" .)

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

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