Lid turned on standard ovenware item (8)
I believe the answer is:
stockpot
'ovenware item' is the definition.
(I've seen this before)
'lid turned on standard' is the wordplay.
'lid' becomes 'top'.
'turned' is a reversal indicator.
'on' is a charade indicator (letters next to each other).
'standard' becomes 'stock' (synonyms).
'top' reversed gives 'pot'.
'pot' after 'stock' is 'STOCKPOT'.
(Other definitions for stockpot that I've seen before include "Utensil for making soup" , "gravy container" , "Container holding base or raw material for soup" , "Cooking vessel for soups" , "kitchen utensil" .)