The most common and most likely answer to this crossword clue is the 6 plus 9 letter word SAMSON AGONISTES
I've seen this crossword clue in The Guardian
S
A
M
S
O
N
A
G
O
N
I
S
T
E
S
More clues leading to the result SAMSON AGONISTES
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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.