Subjected to inflation - completely destroyed (5-2)
I believe the answer is:
blown-up
'destroyed' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?
'subjected to inflation completely' is the wordplay.
I cannot really see how this works, but
'completely' could be 'up' (I've seen this in other clues) and 'up' is present in the answer.
The remaining letters 'blown' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for blown-up that I've seen is " Exploded".)