Stupid person makes cold soup (4)

I believe the answer is:

clod

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

'stupid' is the definition.
(thesaurus)

'person makes cold soup' is the wordplay.
'cold' anagrams to 'CLOD'.
But, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for clod that I've seen before include "Lump of earth or clay" , "Stupid person - compact lump" , "dunce" , "Lump of earth - stupid person" , "Silly person" .)

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

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