National vegetable (5)

I believe the answer is:

swede

This clue is a double definition.

'national' is the first definition.
(I've seen this before)

'vegetable' is the second definition.
(swede is a kind of vegetable)

(Other definitions for swede that I've seen before include "Person like Strindberg" , "plant" , "N European" , "Weeds out to get turnip" , "Northern European" .)

I've seen this clue in The Times.

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