The most common and most likely answer to this crossword clue is the 10 letter word STARCHIEST
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More clues leading to the result STARCHIEST
Buddy explains!
The straight part
We know that "most uptight" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most uptight = starchiest.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 STARCHIEST mean?
STARCHIEST adjective- Of or pertaining to starch.
- Containing starch.
- Having the quality of fabric starch as applied to fabric; stiff, hard; starched.
- Having a starched personality; stiffly formal.