The most common and most likely answer to this crossword clue is the 10 letter word HEADCHEESE
I've seen this crossword clue in The Guardian
H
E
A
D
C
H
E
E
S
E
More clues leading to the result HEADCHEESE
Buddy explains!
The straight part
We know that "“It’s all brawn in LA”" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case “it’s all brawn in la” = headcheese.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.
What does HEADCHEESE mean?
HEADCHEESE noun- A terrine made from the flesh of the head of a pig (such as the face)