Cryptic crossword clue
Book following mad hero's search involving old sea creature 9,4

The most common and most likely answer to this crossword clue is the 9 plus 4 letter word HORSESHOE CRAB

H
O
R
S
E
S
H
O
E
C
R
A
B

Buddy explains!

The straight part
We know that "sea creature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sea creature = horseshoe crab.
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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