The most common and most likely answer to this crossword clue is the 5 plus 8 letter word APPLE POLISHER
I've seen this crossword clue in The Guardian
A
P
P
L
E
P
O
L
I
S
H
E
R
Buddy explains!
The straight part
We know that "toady" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case toady = apple polisher.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.
Crossword Answer definitions
APPLE POLISHER noun- A person who apple-polishes