Crossword Genius

It won’t hold much soap, note, if shaken (8)

Ross

I believe the answer is:

teaspoon

I'm a little stuck... Click here to teach me more about this clue!

'it won't hold much' is the definition.
The definition suggests a singular noun which matches the answer.

'soap note if shaken' is the wordplay.
'soap note' anagrams to 'TEASPOON'.
Though, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for teaspoon that I've seen before include "5 ml container" , "Small medicine dispensing unit" , "Small stirrer" , "Five millilitres (cookery)" , "It creates a stir" .)

I've seen this clue in the Evening Standard.
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