Beef's good and ready to eat (5)
I believe the answer is:
gripe
'beef's' is the definition.
('gripe' can be a synonym of 'beef')
'good and ready to eat' is the wordplay.
'good' becomes 'g' (abbreviation).
'and' means one lot of letters go next to another.
'ready to eat' becomes 'ripe' (I've seen this before).
'g'+'ripe'='GRIPE'
(Other definitions for gripe that I've seen before include "Protest" , "Grumble (colloq.)" , "Grumble informally" , "Complain, grouse" , "Complain; colic (water)" .)