Domestic is inside, cooking pear entrée (9)
I believe the answer is:
appetiser
'entree' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'domestic is inside cooking pear' is the wordplay.
'domestic' becomes 'pet' (I can't explain this - if you can you should believe this answer much more).
'inside' indicates putting letters inside.
'cooking' indicates an anagram (cook can mean to falsify or distort).
'pet'+'is'='petis'
'pear' anagrammed gives 'aper'.
'petis' put within 'aper' is 'APPETISER'.
Can you help me to learn more?
(Other definitions for appetiser that I've seen before include "Small starter dish" , "preprandial treat" , "Aperitif" , "Relish" , "dim sum?" .)