For Robin, we cooked cake (7)

I believe the answer is:

brownie

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

'cake' is the definition.
(I know that brownie is a type of biscuit)

'for robin we cooked' is the wordplay.
'robin we' anagrams to 'BROWNIE'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for brownie that I've seen before include "Junior member of girl's movement ..." , "helpful girl?" , "sweet thing" , "Junior Girl Guide" , "Benevolent helper" .)

I've seen this clue in The Daily Express.

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