You won't remember suffering from it (7)

I believe the answer is:

amnesia

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand how the rest of the clue works.

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(Other definitions for amnesia that I've seen before include "Am I sane? (anag)" , "Recall trouble" , "Seaman I found in state of memory loss" , "Is a name (anag.)" , "Failure to recall" .)

I've seen this clue in The Globe and Mail.

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