1: Scotsman turns to notice drifter (5)
2: Nevertheless, hang about; we are inside (7)
3: Rear oat variety as a way to break up the soil (7)
4: 'Ransom'? Lame. Run 'Rocky I', 'II', 'III', etc. (5,8)
5: Diet I'm crazy about will eventually set boundaries (7)
6: Dreadful bender did result in being laid up. (9)
8: Defusing timer incorrectly can lead to this! (13)
12: Exploits, in Time, founder and glow cold (9)
15: Pattern upset clients (7)
16: A game stuffing ketchup in balloons (7)
17: How like a nobleman not to be late. (5)
18: Something that may move a hammer to engineer a murder (7)
21: Divine instrument for drilling in the mouth (5)