Breaking a plate is a bit of a bloomer (5)

I believe the answer is:

petal

'is a bit of a bloomer' is the definition.
(I've seen this before)

'breaking a plate' is the wordplay.
'breaking' is an anagram indicator.
'plate' with letters rearranged gives 'PETAL'.

(Other definitions for petal that I've seen before include "Leaf-like part of flower head" , "part of seven [VIOLA]" , "Floral leaf" , "Plate (anag.)" , "One piece of corolla" .)

I've seen this clue in the Evening Standard.

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