Possible Clues:

• His written grammar was exemplary: spoken, less tasteful
• Henry Watson --, author of 'A Dictionary of Modern English Usage'
• Hunter of wild birds
• Authority on usage
• One hunting birds
• Compiler of first 'Concise Oxford Dictionary' in 1911
• Lexicographer of more unpleasant disposition, we hear
• Hunter
• His English usage sounds even worse
• His usage of English makes him sound even more unpleasant.