1: Shocking situations, losing first of criminal's footwear (7)
2: Tea a fizzy drink? What a farce! (7)
3: Burdened young man with couple of encumbrances (5)
4: Reunite diverse followers (7)
5: Original caliph adds brave face to UK/Arab struggle (3-4)
6: Naughty pedestrian sounds Scotch? (9)
7: Sterne's novel settlers (7)
9: Blow the whistle on the end of Chinese burn (5)
12: Survey mutants with missing shells for a possible cause of damage (9)
14: A bit of the English course may cause embarrassing situations (7)
15: Pitcher, lunatic, not married (5)
16: They teach large groups of swimmers (7)
17: Recognise terrible smell in Vespers for the Dead? (7)
18: Journey to get crude oil in capital (7)
19: Go back to skyscraper's easternmost exit (7)
21: Twilight: time for affair (5)