Cryptic crossword

Across

3 Charlie's got the hump, the fathead! (5) 8 Car test – nothing's right! (5) 10 A place of rare fertility (5) 11 Lived in Iowa somewhere (3) 12 Swimming tutor possibly (5) 13 Appreciated being attacked? (4,3) 15 Uncharacteristic lapse in a flowery part (5) 18 Lout who'd love to start an affair? (3) 19 Nominally calm, she may give a sneer (6) 21 Aunt Sally's place? (3,4) 22 Warm up for a theatrical part (4) 23 Bit of a show – could be a riot! (4) 24 Be afraid to hold an article that's so very light! (7) 26 Comes up for air in order to complete the exercises (6) 29 Organ needing attention (3) 31 Harmonious name for a heavyweight (5) 32 A miners' group? (7) 34 A great source of taint (5) 35 Did the spadework (3) 36 An acquisition repeated (5) 37 Freed to leg it, possibly? (3,2) 38 Sounds a hoarse utterance! (5)

Down

1 It gets damp as it dries (5) 2 Failed to look not good but bulky (4,3) 4 Being German, he has endless education (4) 5 Pet rodent control operative (6) 6 Dad's got his head on right! (5) 7 City the Italian gent goes around (5) 9 The tawny parts are brown (3) 12 Sweet Evertonians oft upset over charges! (7) 14 Supporter of soccer people close down (3) 16 The man run out? (5) 17 Install only a replacement (3,2) 19 Being young, in the turbulent teens I got a kiss (7) 20 What, out East, can be made into biscuits (5) 21 Villain who never put a cigarette out (5) 23 Free, indeed, to be flouted (7) 24 Catlike, showing endless variation of feeling (6) 25 Bit of a shame he can't act (3) 27 Rogue tuned red (5) 28 It's an optional material! (5) 30 Roomy enough for one horse to go round another (5) 32 Performed some chorus angelically (4) 33 Head of the teachers' union? (3)