Red meat (4)
'red meat' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for beef that I've seen before include "Muscle; meat; grievance" , "Meat - complaint" , "Brawn; grumble" , "Complain; meat" , "Strength - grievance" .)
(Other definitions for lamb that I've seen before include "Skipper" , "Exemplar of innocence" , "Writer" , "English essayist" , "Young shee" .)