Odd number (8)

I believe the answer is:

singular

This clue is a double definition.

'odd' is the first definition.
(I know that odd can be written as singular)

'number' is the second definition.
(I've seen this before)

(Other definitions for singular that I've seen before include "Remarkable - unique" , "Unique - nails rug (anag)" , "Extraordinary - just one (8)" , "Extraordinary - conspicuous - sole" , "Unusual, maybe unique" .)

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

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