The most common and most likely answer to this crossword clue is the 8 letter word PRESUMES
I've seen this crossword clue in The Daily Telegraph
P
R
E
S
U
M
E
S
Buddy explains!

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 PRESUMES mean?
PRESUMES verb- With infinitive object: to be so presumptuous as (to do something) without proper authority or permission.
- To perform, do (something) without authority; to lay claim to without permission.
- To assume or suggest to be true (without proof); to take for granted, to suppose.
- To be presumptuous; with on, upon, to take advantage (of), to take liberties (with).