Possible Clues:

• Eccentric that is encountered in strange dream
• Had involvement in incident, attending a literary tea party
• He hosted Alice at a tea party (2 words)
• Participant in the 16 in 3,8
• Bizarre party host could be seen as threat
• March Hare ruined his watch (Alice)
• Unlikely character perhaps had some substance, outwardly
• He made that dream that Alice encountered
• Character whose tag read '10/6', with 'The'
• "Why is a raven like a writing-desk?" inquirer