1: Sums are written up for scholar (7)
2: Gantry in Hilton Hotel, Mermaid Beach (5)
3: In the manner of a girl (3)
4: Ask for bit of bread with melted cheese (7)
5: Guarantee authorisation (7)
6: Vulgar and insipid (9)
9: Make a deep impression, bound by ties initially thought to be most vexatious (9)
11: Hobo accepts employment at a home on the water (9)
13: In abundance, doing a bun dance (9)
15: Again send out note describing Susie misbehaving (7)
16: Where some 16-downs fell, its beyond cover (3,4)
17: Lies for each twelve men (7)
18: Reptile eventually climbing a hill (5)
20: Blunder into tall African mammal, with no infrared (5)
22: Freshen the atmosphere (3)