The most common and most likely answer to this crossword clue is the 8 letter word SUPPOSED
I've seen this crossword clue in Financial Times
S
U
P
P
O
S
E
D
More clues leading to the result SUPPOSED
- First couple of subs quietly sat and thought
- Sat following drink and considered
- Thought of beginning to diet after drink with model
- Considered well upset seeing drunk outside
- Alleged drunk swallowing very big measure
- Sat still after drink, it’s apparent
- Second high point of sale: further reduction of 24 assumed
- After drink, sat and hypothesised
- Sat artistically by drink and thought
- Sat by drink and thought
Buddy explains!

The straight part
We know that "thought" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thought = supposed.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 SUPPOSED mean?
SUPPOSED verb- To take for granted; to conclude, with less than absolute supporting data; to believe.
- To theorize or hypothesize.
- To imagine; to believe; to receive as true.
- To require to exist or to be true; to imply by the laws of thought or of nature.
- To put by fraud in the place of another.
- Presumed to be true, but without proof
- (with infinitive) Generally considered or expected.
- (with infinitive) Having an obligation.
- (with infinitive) Intended.