Possible Clues:

• Frequently, in poesy
• Repeatedly, in verse
• Frequently T's?
• '___ in the Stilly Night' (Thomas Moore lyric)
• Repeatedly, briefly
• Frequently, in brief
• Repeatedly going round centre of Watford
• Consistently poetic, but putting nothing on paper
• Usually T's?
• 'Twixt ne'er and e'er