Cryptic crossword No 3,495

Across

1. In football a masterful Argentinian beast (5)
2. Beat prisoner then question endlessly (7)
3. Accepted 21 in our bit regularly with stronger reason (1,8)
4. Leave to use Tube? (2,7)
5. Mercantile old kingdom invading Mongol borders after cobalt (10)
6. Bill quitting drug habit in a manner of speaking (7)
7. Oscar getting into gear when stoned (3,2,2)
8. Stop bingo in military building (10)
9. Nice day when Cardinal's force replaced by justice (4)
10. Pigs seen to care - left scattered coppers (6,9)
11. Party axes old tart (4)
12. Overrode protests backing inside sink (7)
13. Inexperienced naturist initially agreed to be undressed beforehand (5)

Down

1. Harshness of nice doctor being beaten entering depraved place (9)
2. Disadvantage to pass current EU policy (8)
3. Internet business catastrophe involving bankrupt alcoholic ultimately (6)
4. Belize seizing drunk with intensive activity (5)
5. Oddly smelly hooligans becoming traitors (8)
6. Light unit panels concealing Jack's indulgences (8)
7. Gear is able to uplift spirit (6)
8. Special attention given to soldiers - soldiers with assegais perhaps (8)
9. One period after another bringing senility (6)
10. It's rumoured Native American gets paid for more than one volte face (1-5)
11. Partners answer children in Scottish dialect (5)
12. D-drink with Ganymede, perhaps (4-4)
13. Moulded gold beaver (6)
14. Repairmen organised nice scam with hotel (9)
15. Large deer starts to crack open carapace picking up mollusc (6)
16. Mythical beast on atrium crumbling (8)