Condensation managed on tiles, but damages the rendering (13)

I believe the answer is:

mistranslates

'damages the rendering' is the definition.
(to translate or render badly)

'condensation managed on tiles' is the wordplay.
'condensation' becomes 'mist'.
'managed' becomes 'ran' (I've seen this before).
'on' says to put letters next to each other.
'tiles' becomes 'slates'.
'mist'+'ran'+'slates'='MISTRANSLATES'

'but' acts as a link.

I've seen this clue in The Times.

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