The most common and most likely answer to this crossword clue is the 2 plus 6 plus 2 letter word ON BEHALF OF
I've seen this crossword clue in The Guardian
O
N
B
E
H
A
L
F
O
F
Buddy explains!
The straight part
We know that "Representing/" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case representing/ = on behalf of.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.