The most common and most likely answer to this crossword clue is the 11 letter word LOTUS-EATER
I've seen this crossword clue in The Guardian
L
O
T
U
S
-
E
A
T
E
R
More clues leading to the result LOTUS-EATER
Buddy explains!
The straight part
We know that "Pleasure-seeker" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pleasure-seeker = lotus-eater.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.