Possible Clues:

• Adore material supplied by Cavalier poet
• Well-mannered libertine from Samuel Richardson's novel 'Clarissa'
• Poet said to be very fond of decorative trimmings
• See 12 across
• Richard --, 1618-57, English Cavalier poet
• Mathematician and computer pioneer Ada
• Poet’s line, one on compassion
• See 10
• Poet to be very fond of Anglo-Catholic finery?
• 'Stone walls do not a prison make' poet