5  Occasionally outswear drug fiend (4)

 9  Make yourself scarce - Marc's back (5)

10 Treatment of man gatecrashing rowdy party (7)

11 Guy encountered in Denver, a Yankee (3)

12 Unbiased I fancy (9)

13 Stare wildly meeting unknown substitute (6)

15 Flee from Leek we're told (6)

17 Express means of providing information? (9)

19 Theatre company's agent (3)

20 Gloomy fighter pilot's disgusted expression (7)

21 Half-hearted niggle about Scottish town (5)

22 Cash register discovered in Kirkintilloch (4)

23 In good health? I suppose I accept that (4,4)

 1  Madly reveres book (7)

 2  From the outset doctor is really thorough, yet unhygienic (5)

 3  What a theatregoer may do to become effective (4,4,4)

 4  In control like a cherry? (2,3)

 6  Social workers return to protect French friend's staying power (7)

 7  Two men are sort of blue (5)

 8  Scottish players press line creating goal for Christiaan Barnard (5,7)

14 Spotted economist in factory (7)

16 Measure penal reform, and call up for jury service (7)

17 Bad thing, darkness (5)

18 Portion of food taken to church (5)

19 Villain to proceed upwards in French street (5)