Chop up less conventional root crop (4)

I believe the answer is:

eddo

'root crop' is the definition.
(eddo is a plant)

I don't understand the rest of the clue.

(Other definitions for eddo that I've seen before include "Edible corm" , "Edible plant" , "elephant's ear" , "Tropical corm vegetable" , "taro tuber" .)

I've seen this clue in The Times.

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