The most common and most likely answer to this crossword clue is the 8 plus 5 letter word ABERDEEN ANGUS
I've seen this crossword clue in The Times
A
B
E
R
D
E
E
N
A
N
G
U
S
More clues leading to the result ABERDEEN ANGUS
- Protein-rich food source, a new green bean to eat beginning to disagree with us
- Ensure bandage unravels: a source of beef?
- Ensure bandage is tight for cow
- Unseen, a badger tormented a bovine animal
- Ensure bandage moved lower
- Highlands resident cooked bangers and legumes occasionally
- A breed butchered by girl, using all except heart for mincing?
- Source of beef from dodgy bangers and legume used regularly?
- Provider of beef under an age BSE affected
Buddy explains!
The straight part
We know that "Source of beef" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case source of beef = aberdeen angus.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.