The most common and most likely answer to this crossword clue is the 8 letter word GADABOUT
I've seen this crossword clue in The Daily Telegraph
G
A
D
A
B
O
U
T
More clues leading to the result GADABOUT
- Restless soul's complaint after eating a fish
- Disease claiming a flipping unpleasant pleasure-seeker
- Rover for Deputy Adjutant-General?
- Rover corporation’s retaining a lawyer with personal hygiene issue
- Partygoer complaint claims “a smear”
- Fun-seeker‘s complaint when catching a fish
- Hedonist a bit inhibited by ‘hedonist’s complaint’
- Crikey! A boxing contest for a social butterfly
- Disease restricting an expert, one who likes to be on the move
- Pleasure seeker appears good before a bad turn gets exposed
Buddy explains!

The straight part
We know that "Hedonist" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hedonist = gadabout.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 GADABOUT mean?
GADABOUT noun- Someone who restlessly moves from place to place, seeking amusement or the companionship of others.