Cryptic crossword No 4,070

Across

1. One that makes do? (6)
2. So one has consumed time doomscrolling, perhaps? (2,3,3)
3. Hit three freebies? (5,5,5)
4. Define flexible: regularly usable as required (2,5,2)
5. What helps to solve one thing over another? (4,8)
6. Burst artery, choked by patchily burnt fruit pastry (5,4)
7. In retrospect, a fleshy nub produces viral disease (5)
8. Hit three scratches? (5,5,5)
9. Dark aspects of steamship flanking company with all exposed (6)
10. Run away from or peel off to form clandestine union (5)
11. Sue Merkel, say, after failing to secure requester of political protection? (6,6)
12. Spooner's porch turnip's up to the shoulders (4-4)

Down

1. Tower of London is cage for swine, all quietly covered up by British (3,3)
2. Movie genre from complex frames (6)
3. Give up identities of foremost among spies, tailing oddly near me, twice! (4,5)
4. That equally referred to as me, drunk, entering naked - except for dunce's cap! (8)
5. Digital encyclopedia having occasional entries swapped for fruit (4)
6. Have no fellow tenants to make up calf meat and bone's marrow wedges (4,5)
7. In the style of British-American bloke from Birmingham, perhaps? (8)
8. Uncovered Munich burying metal at face value (8)
9. Northern Michigan entering league of petrostates - where anyone gets to join? (4,3)
10. Men who are kids too, perhaps? (6)
11. Steinbeck novella originally printed with shoddy leather binding (3,5)
12. Freud's three I had heard without tears (3-4)
13. Something placatively said to understand, having no king and no wife (3,3)
14. On the radio, group to have lots of active members (4)
15. Rings to stitch up peers checking rent (7)
16. Pronounced strong biological marker as body's sanitary condition (7)