Crave starter of burrito with melted cheese (7)
I believe the answer is:
beseech
'crave' is the definition.
(thesaurus)
'starter of burrito with melted cheese' is the wordplay.
'starter of' indicates taking the first letters.
'with' means one lot of letters go next to another.
'melted' indicates anagramming the letters.
The first letter of 'burrito' is 'b'.
'cheese' with letters rearranged gives 'eseech'.
'b'+'eseech'='BESEECH'
(Other definitions for beseech that I've seen before include "Beg earnestly, plead" , "pray" , "Sue" , "Request earnestly" , "Entreat, implore" .)