Cryptic crossword No 3,819

Across

1. Awkwardly rotate to hide artist (8)
2. Standard sandwiches harm support (6)
3. Sedate shellfish when rearranging innards (4)
4. Footwear pedlar lies dreadfully (10)
5. Pair regressing day by day (4)
6. Star author penetrating block in church (6)
7. Give title as Icy Rocks (10)
8. Gratuitous sex obscuring old behind irritates (8)
9. Entrance doctor, concealing spectacles (4)
10. One imbibes less than half of absinthe or ale half-heartedly (8)
11. Start to upbraid cold husband (6)
12. Fierce woman losing head after backsliding traitor leaves (8)
13. Female network say back-projection helping stability (6)
14. Intelligence that can be measured by nits (10)
15. Betting system taken from Esperanto teacher (4)
16. Setter might come from this town marketplace (4,6)

Down

1. Agreed finally to turn right leading to wood (3)
2. Original reference letter (9)
3. Do excessive papers on counter (5)
4. Starts to hoot inanely, being entertained by way-out show (7)
5. Artisans initially assemble to enlarge entry for law officer (8,7)
6. Sailors drinking whenever given figurehead duties (7)
7. Large amounts of obstruction on highways detaining Member of Parliament (11)
8. Half-cut novelist with horse-cloth coming up with Rabelaisian character (9)
9. Sally out of bounds embracing women instead of large tool (3)
10. The French supporting expensive tower (7)
11. Purple colour seen during recurring clinical illness (5)
12. Allowing commencement of torture without becoming unkind (11)
13. Refuge has time to accept naked Greta? (7)