Vegetables might be problematic in this house, they say? (5)

I believe the answer is:

leeks

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'vegetables' is the definition.
(leek is a kind of vegetable)

I cannot understand how the remainder of the clue works.

(Other definitions for leeks that I've seen before include "Scallions" , "Welsh emblems" , "Vegetables - keels (anag)" , "Vegetables, emblem of Wales" , "Emblems of 19" .)

I've seen this clue in The Irish Times.

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