Beg for starter of bacon and cheese crackers (7)
I believe the answer is:
beseech
'beg' is the definition.
(I've seen this in another clue)
'starter of bacon and cheese crackers' is the wordplay.
'starter of' says to take the initial letters.
'and' means one lot of letters go next to another.
'crackers' is an anagram indicator (informal term for mad).
The initial letter of 'bacon' is 'b'.
'cheese' anagrammed gives 'eseech'.
'b'+'eseech'='BESEECH'
'for' acts as a link.
(Other definitions for beseech that I've seen before include "request, urgently" , "Beg earnestly, implore" , "petition" , "Fervently ask (someone) for something" , "Sue" .)