Possible Clues:

• Something splendid by Lake Poet
• Poet's extra line ultimately added to wonder
• Poet to be filled with wonder looking over lake
• Wonderland minus/plus poet?
• Andrew —, poet
• Andrew —, English poet
• Poet who wrote To His Coy Mistress
• Andrew --, 1621-78, metaphysical poet
• Wonder about Lake poet
• Feel astonishment meeting line produced by poet