It isn't even peculiar! (3)

I believe the answer is:

odd

I'm a little stuck... Click here to teach me more about this clue!

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

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

Can you help me to learn more?

(Other definitions for odd that I've seen before include "Unusual, strange" , "Matchless" , "Extraordinary" , "Strange, peculiar" , "Peculiar sort of number?" .)

I've seen this clue in the Sydney Morning Herald.

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