A peer who fancies men and women is not quite right (1,3,3)

I believe the answer is:

a bit off

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'not quite right' is the definition.

I cannot understand how the rest of the clue works.

(Other definitions for a bit off that I've seen before include "In bad taste" , "a small reduction in price" , "Substandard" , "not very polite" , "Rather rude" .)

I've seen this clue in The Guardian.

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