Right piece mixed up in what the chef uses (6)
I believe the answer is:
recipe
'what the chef uses' is the definition.
I can't tell whether this definition defines the answer.
'right piece mixed up in' is the wordplay.
'right' becomes 'r' (abbreviation).
'mixed up' indicates anagramming the letters.
'in' indicates putting letters inside.
'piece' anagrammed gives 'ecipe'.
'r' placed inside 'ecipe' is 'RECIPE'.
Can you help me to learn more?
(Other definitions for recipe that I've seen before include "Directions for food preparation" , "Cook's formula" , "Step by step method" , "Formula for food dish" , "Method for cooking" .)