Habituated to being ruined? (6)

I believe the answer is:

inured

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'habituated' is the definition.
(inuring is a kind of habituating)

'being ruined?' is the wordplay.
'ruined' can be anagrammed to 'INURED'.
However, I'm unsure how the anagram is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for inured that I've seen before include "Hardened as by experience" , "Accustomed to hardship" , "Hardened, maybe ruined" , "used to it" , "Hardened against, emotion say" .)

I've seen this clue in the Evening Standard.

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