Cryptic crossword No 4,065

Across

1. Medicare ran poorly, limiting a somewhat major aspiration for US working class (8,5)
2. Noel casually humming after reducing crime (6)
3. An evolved sheep reportedly result of strict diet and exercise? (1,3,3)
4. Without truly nonpartisan leaders, corruption of US state ballot is extremely significant (4,3,3,5)
5. Missing first big party of the summer (7)
6. "No cap?" That's not edgy, not any more! (7)
7. Rotten song is an anthem? (3,4,3,5)
8. Makes pretty penny after rocky start at university (5,2)
9. Store packing order finally to ship overseas (6)
10. No tonic for my last drop of gin cocktail? Heresy! (13)

Down

1. Reclusive type in uniform finally has sex with her on top (6)
2. Ability to determine depth of crisis, oddly described on the radio? (9,6)
3. Jenga salesman eating up dish (7)
4. Confused nan; TV ad declares seasonal schedules with Countdown moving daily to 8? (6,9)
5. Okay, great (4,4)
6. It's said beneficiaries restricted artery and breathing tubes (7)
7. Old lady slightly upset by openings of lurid sex clubs (5)
8. One runs around in glamorous head covering (8)
9. Bank on eBay somehow securing right to support primarily selling weed (5,2)
10. Surprise over agreement taking place without force (7)
11. Loud note vibrating at high frequency (5)
12. United Nations start to provide assistance that's overdue (6)