Cooking vessel two pets smashed (7)
I believe the answer is:
stewpot
'cooking vessel' is the definition.
(I've seen this in another clue)
'two pets smashed' is the wordplay.
'smashed' indicates anagramming the letters.
'two'+'pets'='twopets'
'twopets' anagrammed gives 'STEWPOT'.
(Other definitions for stewpot that I've seen before include "vessel" , "casserole" , "Pan" , "simmering here?" .)