Surrealist 1D first to finish vegetable (4)

I believe the answer is:

leek

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

'vegetable' is the definition.
(I know that leek is a type of vegetable)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for leek that I've seen before include "Vegetable symbol of Wales" , "Vegetable of the onion family" , "Plant; Welsh emblem" , "Vegetable emblem of Wales" , "Vegetable associated with Wales" .)

I've seen this clue in The Independent.

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