My status is no longer single - but it's not good (8)

I believe the answer is:

impaired

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'good' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for impaired that I've seen before include "Damaged or weakened, maybe in health" , "hurt" , "Caused weakening, damaged" , "Spoiled" , "handicapped" .)

I've seen this clue in The Independent.

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