The most common and most likely answer to this crossword clue is the 7 letter word MUDDLED
I've seen this crossword clue in The Guardian
M
U
D
D
L
E
D
Buddy explains!
The straight part
We know that "not thinking clearly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not thinking clearly = muddled.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 MUDDLED mean?
MUDDLED verb- To mix together, to mix up; to confuse.
- To mash slightly for use in a cocktail.
- To dabble in mud.
- To make turbid or muddy.
- To think and act in a confused, aimless way.
- To cloud or stupefy; to render stupid with liquor; to intoxicate partially.
- To waste or misuse, as one does who is stupid or intoxicated.
- Confused, disorganised, in disarray.