Plant with bitter leaves used in green salads (6)

I believe the answer is:

endive

(Other definitions for endive that I've seen before include "Veined (anag) - salad plant" , "Salad plant with crisp curly leaves" , "Chicory-type salad vegetable" , "salad ingredient" , "Plant used in salads" .)

I've seen this clue in The Guardian.

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