Complain at sirloin (4)
I believe the answer is:
beef
This could be a double definition.
'complain' is the first definition.
(beefing is a kind of complaining)
'sirloin' is the second definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'at' is the link.
Can you help me to learn more?
(Other definitions for beef that I've seen before include "See 24" , "Argument" , "Strength - grievance" , "Meat - complaint" , "Bovine flesh" .)