Possible Clues:

• A fair amount of spare time for you on here
• Obsession shown in hunting bird with cavalry
• Thing in cooker, topping with grating, we're told
• Child's toy - favourite topic
• Animal mounted to pursue grouse ?
• Sort of shore bird, initially, as favourite topic
• Perhaps amount of fair fun, but not for a living
• One's favourite topic or obsession
• Obsession with falcon seen above mount
• Preoccupation of nag in evidence when child is playing?