Crossword Genius

It holds liquid of course (4,5)

Ross

I believe the answer is:

soup plate

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'it holds liquid' is the definition.
The definition suggests a singular noun which matches the answer.

'of course' is the wordplay.
'of' becomes 'soup' (I can't explain this - if you can you should believe this answer much more).
'course' becomes 'plate' (plate is a kind of course).
'soup'+'plate'='SOUP PLATE'

Can you help me to learn more?

(Other definitions for soup plate that I've seen before include "Item of crockery" , "Deep dish" , "Serving dish" .)

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