Possible Clues:

• Poet's mature relationship with nature?
• Love and move or cough and bough eg
• Ponder and wonder what this might be? Looks like it
• Similarity such as that between love and move
• Poet's boast, heard in blank verse presumably
• For example, my move in relation to love?
• Two words that are spelt similarly but pronounced differently
• Verse feature that sounds wrong? Check out Frost, say
• Poetic device exemplified in Keats and Yeats
• Rough cough, say