There is no one-word anagram, but there is the phrase "a fistula."
The longest words other than fistula are flatus and faults.
The letters spell the word casino.
The letters spell the word "freelance."
The letters spell the word geometrical.
The letters APTRUSIS spell the word "upstairs."
Those letters will spell the word vinegar.
The letters can spell the word publications (or No, a publicist!).
These letters unscramble to spell the word herbal.
The letters spell the word "mineralogist" (rock scientist).
Unscrambled, the letters 'neucd' spell the word 'dunce'.
The letters NIPPES spell the word "pepsin", a flavoring.
The letters 'sumsie' unscrambled spell the word misuse.
Those letters spell the word disown.