16.

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Across
  1. 2. Room between two things, space (3)
  2. 3. Non-western work has ruined one, leading to fatal burn-out
  3. 5. Hiss, splutter; burn (out)
  4. 7. Step out with girl in palm ... (4)
  5. 10. SPACE Leave room between lines
  6. 11. SPACING Walks twice as fast with more room between the lines (6,7)
  7. 14. Leading strollers stepped out with room between them
  8. 15. Colour wont burn out (8)
  9. 16. 'Step out with new set in groups of seven (7)'
  10. 18. Room between the Study and Billiard Room, in Clue
  11. 19. Step out with a German sculptor
  12. 20. Complete burn-out on old range
Down
  1. 1. I burn out in academic post
  2. 4. Room between the study and the lounge in the game Clue
  3. 6. BAG Barbecuing burn? - out with the cooler (6)
  4. 8. At two before midnight step out with presence (10)
  5. 9. Such candles soon burn out
  6. 12. I step out with Reg - you call that glamorous? (8)
  7. 13. Bizarre burn-out's curable now and then (7)
  8. 17. Burn-out male's battling can be overcome (12)