Possible Clues:

• The volume of the lizard-like lexcion
• Reference book he's kept in house?
• Wordlist a user thus rearranged
• One is bound to have words with the lizard, it seems
• Guy's covered in bull, resulting in plenty of choice words
• Sign chap's immersed in work we may refer to
• A sign he's included for word-lovers
• Sign the man's hiding inside depository
• Wordy book's principal theme briefly enthrals Isaac's boy
• The man's surrounded by stars in wordy book