Plate smashed, bit of a bloomer (5)
I believe the answer is:
petal
'bit of a bloomer' is the definition.
(I've seen this before)
'plate smashed' is the wordplay.
'smashed' indicates anagramming the letters.
'plate' is an anagram of 'PETAL'.
(Other definitions for petal that I've seen before include "part of seven [VIOLA]" , "Small seal set in a ring" , "Corolla leaf" , "Part of a flowers corolla" , "Flower part seen on plate" .)