English boy in China cooked hot snack (9)
I believe the answer is:
enchilada
'hot snack' is the definition.
(Mexican snack)
'english boy in china cooked' is the wordplay.
'english' becomes 'e' (abbreviation).
'boy' becomes 'lad' (informal term for boy).
'in' means one lot of letters goes inside another.
'cooked' indicates an anagram (letters cooked into a new form).
'china' with letters rearranged gives 'nchia'.
'lad' put inside 'nchia' is 'nchilada'.
'e'+'nchilada'='ENCHILADA'
(Other definitions for enchilada that I've seen before include "Mexican tortilla with chilli" , "Mexican dish" , "Tortilla and chilli dish" , "hot dish" , "spicy snack" .)