A lot of talk

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Across
  1. 1. Morse's (8)
  2. 4. sarkiest characters star (8)
  3. 9. The fifth in Morse. (4,4)
  4. 10. like i smile crooked (6)
  5. 12. shouldn't've used this twice (10)
  6. 15. 'Oh? No matter, Pia.' (12)
  7. 16. to double-barrell name is somewhat flashy phenomenon (6)
  8. 17. starts clauses or list of nouns (5)
  9. 18. byronic dropping facade could be this (5)
  10. 20. wave left in tide (5)
  11. 21. & manspread all over the place (8)
Down
  1. 2. child lies around? an understatement (7)
  2. 3. visually is monocle (4-5)
  3. 4. utterances united under uniform umbrella (12)
  4. 5. 'Psst. Shhh. Hiss' (9)
  5. 6. interrogate disciple? (8,4)
  6. 7. boy! helper runs as fast as the wind, say (9)
  7. 8. race was a hit - a splash (4)
  8. 11. used ham trope? (8)
  9. 13. trim number of dissertations (of extra information) (11)
  10. 14. this, kept Mike, in stupor (5)
  11. 19. Zero unknowns yet fool (8)