Stop cooking with eastern dressing (5)
I believe the answer is:
pesto
'dressing' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'stop cooking with eastern' is the wordplay.
'cooking with' indicates anagramming the letters (cook can mean to falsify or distort).
'eastern' becomes 'e'.
'stop' mixed up with 'e' can make 'PESTO'.
Can you help me to learn more?
(Other definitions for pesto that I've seen before include "Sauce made of basil and cheese" , "Ligurian food" , "Green sauce" , "Sauce of basil, pine nuts and garlic" , "Basil-based sauce" .)