3. was punishment at school & one of man's inventions (5 & 5)
5. could be shortbread & tom was a small one (7 & 8)
9. snooker scores & found in kitchen (4 & 4)
13. xmas treat & safety device for doors (4 & 5)
15. cold blooded vertebrate & used to gamble (4 & 5)
17. holiday resort & owls are this (9 & 4)
18. this fills with water & needed for entry (4 & 3)
20. carries water & comfy at night (4 & 8)