A mistake in the garden (7)

I believe the answer is:

bloomer

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'a mistake' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for bloomer that I've seen before include "A slangy blunder or flower in blossom" , "Stupid mistake" , "Big mistake" , "Crusty loaf" , "Large slip" .)

I've seen this clue in The Irish Independent and The Globe and Mail.

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