Wind? Wasn’t our lot! (5)

I believe the answer is:

notus

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'wind?' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'wasn't our lot' is the wordplay.
'wasn't' becomes 'not' (I can't explain this - if you can you should believe this answer much more).
'our lot' becomes 'us'.
'not'+'us'='NOTUS'

Can you help me to learn more?

(Another definition for notus that I've seen is " Southerly wind".)

I've seen this clue in The Sunday Times.

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