When it's not wet or not sweet, add salt (3,6)

I believe the answer is:

dry season

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'when it's not wet' is the definition.
I can't judge whether this defines the answer.

'not sweet add salt' is the wordplay.
'not sweet' becomes 'dry' ('dry' is the opposite to 'sweet').
'add salt' becomes 'season' (I've seen this before).
'dry'+'season'='DRY SEASON'

'or' acts as a link.

Can you help me to learn more?

(Another definition for dry season that I've seen is " Any dosser (anag) - no rains at this time".)

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

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