Cryptic crossword clue
Fitness fanatic making one change — one’ll get rid of bad influences 9

The most common and most likely answer to this crossword clue is the 9 letter word EXORCISER

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "one’ll get rid of bad influences" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one’ll get rid of bad influences = exorciser.
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.

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