Possible Clues:

• Frequently, to Byron
• Regularly, in poetry
• Frequently, briefly
• Old newspaper read time and again
• Kings etc. secure following with frequency
• T's frequent this
• Thomas Moore poem '___ in the Stilly Night'
• T's able to frequent this
• 'So ___ have I invoked thee for my Muse': Shak.
• Frequently and in no little measure!