When mistreated, it ruins media like microfiches? (12)

I believe the answer is:

miniaturised

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'when mistreated it ruins media like microfiches?' is the definition.
I can't judge whether this defines the answer.

'when mistreated it ruins media' is the wordplay.
'when mistreated' indicates an anagram.
'it'+'ruins'+'media'='itruinsmedia'
'itruinsmedia' is an anagram of 'MINIATURISED'.

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