Traditional English folk song (12)

I believe the answer is:

greensleeves

(Other definitions for greensleeves that I've seen before include ""My lady" of old folk song" , "air of the past" , "Traditional Elizabethan folk tune and ballad" , "(Lady in) old English song" , "Brownshirts would never display such" .)

I've seen this clue in The Guardian.

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