Possible Clues:

• .E? What a pet!
• Fuss over, with 'on'
• Pamper, with ''on''
• Be extremely and uncritically fond of
• Be fond of, with ''on''
• Spoil (with ''on'')
• Be too fond of, with 'on'
• Act the affectionate grandparent
• Lose acuity
• Act feeblemindedly