Standard bloomers? (5)

I believe the answer is:

roses

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'bloomers?' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for roses that I've seen before include "Blooms" , "Flowers, usually red, pink, white or yellow" , "Flowers of 15th century war" , "northern counties, symbolically" , "Beautiful flowers, seen annually in Tralee" .)

I've seen this clue in the Evening Standard.

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