These eggs must be cooked with meat, understand? (3,3,7)
I believe the answer is:
get the message
'understand?' is the definition.
(I've seen this before)
'these eggs must be cooked with meat' is the wordplay.
'must be cooked with' is an anagram indicator (letters processed or cooked into a new form).
'these'+'eggs'='theseeggs'
'theseeggs' mixed up with 'meat' gives 'GET THE MESSAGE'.
(Other definitions for get the message that I've seen before include "Understand what is meant" , "Understand what is implied by a remark or action" , "Understand (colloq.)" , "Access text on phone" , "Cotton on" .)