Rusted torc neglected by one committed to ruin (10)

I believe the answer is:

destructor

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'ruin' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'rusted torc neglected by one committed' is the wordplay.
'rusted torc' anagrams to 'DESTRUCTOR'.
But, I'm not clear how the anagram is indicated.

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in the Irish Times.

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