Cabbage or turnip as carbs? I must need correcting (8)

I believe the answer is:

brassica

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'cabbage' is the definition.

'turnip as carbs? i must need correcting' is the wordplay.
'as carbs? i' anagrams to 'BRASSICA'.
But, I am unsure how the anagram is indicated.

'or' is the link.

Can you help me to learn more?

(Other definitions for brassica that I've seen before include "Cabbage, broccoli, etc." , "Turnip and cabbage genus" , "Swede, say" , "Plant of cabbage genus" , "Cabbages, broccoli etc." .)

I've seen this clue in The Guardian.

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