The most common and most likely answer to this crossword clue is the 7 letter word SURMISE
S
U
R
M
I
S
E
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 SURMISE mean?
SURMISE noun- Thought, imagination, or conjecture, which may be based upon feeble or scanty evidence; suspicion; guess.
- Reflection; thought; posit.
- To imagine or suspect; to conjecture; to posit with contestable premises.