Yellow-flowered shrub used as an emblem by the Plantagenet kings (5)

I believe the answer is:

broom

(Other definitions for broom that I've seen before include "Yellow-flowered shrub" , "Shrub or sweeping brush" , "Shrub and cleaning implement" , "Sweeper (said twice for a car!)" , "Long-handled brush" .)

I've seen this clue in The Mirror.

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