Petal-shaped dish (5)
I believe the answer is:
plate
'dish' is the definition.
(plate is a kind of dish)
'petal-shaped' is the wordplay.
'shaped' indicates an anagram.
'petal' anagrammed gives 'PLATE'.
(Other definitions for plate that I've seen before include "This glass is thick as for shop window" , "Item of crockery" , "Thin sheet, as of glass" , "trophy" , "From which food is eaten or served" .)