Did it come up as a potential bloomer?

I believe the answer is:

rosebud

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

I don't understand the remainder of the clue.

(Other definitions for rosebud that I've seen before include "bloomer, when tight" , "Immature rambler" , "Preminger film" , "Partly opened flower" , "Citizen Kane's sleigh" .)

I've seen this clue in the Evening Standard.

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