1: Young boy capturing us with snapshot, initially incurring mistrust (9)
2: Again Italian couple is late (7)
3: Examiner for each drug addict (7)
5: Drunkard turns up near beach, reversing new habit, to sleep fitfully (4,3,4)
6: Counted time on one's side (7)
7: An animal which flies high but comes back for a place to wash (7)
8: Pick a wrong angle (5)
12: Lepers treated by North Dakota specialist? Brilliant! (11)
15: Oscillating crystal perhaps not so rare (9)
16: Administered dose of vitamin (between 100 and 1000) in head (7)
17: Be all ears about the growth of the Highlands (7)
18: Superficial passage stuck into pig (7)
19: Tea a fizzy drink? What a farce! (7)
20: Hook Id display in religious showdown (5)
23: Walesa still embodies how Nobel Laureates soar? (3)