Work doling out soup (4)

I believe the answer is:

opus

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'work' is the definition.
(an opus is an artistic work)

'doling out soup' is the wordplay.
'soup' can be anagrammed to 'OPUS'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for opus that I've seen before include "Piece of music (with number)" , "Major work" , "Work (of a composer?)" , "Musical piece" , "Showing creative skill" .)

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

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