Not even sufficient, strange as it may seem (5,6)

I believe the answer is:

oddly enough

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'strange as it may seem' is the definition.
(I've seen this before)

'not even sufficient' is the wordplay.
'not even' becomes 'oddly' (I can't justify this - if you can you should give a lot more credence to this answer).
'sufficient' becomes 'enough' (similar in meaning).
'oddly'+'enough'='ODDLY ENOUGH'

Can you help me to learn more?

(Other definitions for oddly enough that I've seen before include "Strange as it seems" , "strange as it may seem" .)

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

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