Destructive prince blasted over written promises (10)

I believe the answer is:

pernicious

'destructive' is the definition.
(thesaurus)

'prince blasted over written promises' is the wordplay.
'blasted' is an anagram indicator.
'over' means one lot of letters go next to another.
'written promises' becomes 'ious' (IOU's are promises to pay a debt).
'prince' is an anagram of 'pernic'.
'pernic'+'ious'='PERNICIOUS'

(Another definition for pernicious that I've seen is " Destructive and harmful".)

I've seen this clue in The Independent.

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