Cub oilmen, oddly, grow this plant (9)

I believe the answer is:

columbine

(Other definitions for columbine that I've seen before include "servant girl in old panto" , "pantomime character" , "Garden flower - Harlequin's partner" , "One with Harlequin, Pierrot, etc" , "Flower - Harlequin's sweetheart" .)

I've seen this clue in The Irish Times.

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