Crossword Genius

Gale ordered sweet and sour (9)

Ross

I believe the answer is:

souwester

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'gale' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'ordered sweet and sour' is the wordplay.
'ordered' is an anagram indicator.
'and' is a charade indicator (letters next to each other).
'sweet' put after 'sour' is 'soursweet'.
'soursweet' anagrammed gives 'SOUWESTER'.

Can you help me to learn more?

(Other definitions for souwester that I've seen before include "Mariner's waterproof hat" , "Waterproof hat with wide slanting brim" , "Waterproof hat (3'9)" , "It helps keep the salt dry" .)

I've seen this clue in The Independent.
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