Cryptic crossword No 3,126

Across

1. Boy sterilises a little mollusc (6)
2. Mate takes drug out of back passage (4)
3. Fastening behind leg (6)
4. We'll pay for this duty (4)
5. Setter covered with poop, raked ends off (8)
6. Odysseus returned here with a cat skinned (6)
7. Oxford or Cambridge's endless heavens before me, totally empty (10)
8. Industry CEO abandoned non-urban areas. (11)
9. PA in good time after finishing copy (6)
10. Italian's verdict ("beautiful!") on Portuguese city and Notting Hill market. (10)
11. Abramovich's one absurd goal to get horribly rich (8)
12. Like an eccentric person in a bad mood? (6)
13. Caribbean side meet South Africa on way - fantastic! (6)

Down

1. Calm lake? (6)
2. Spooner questions need to catch rays for Asian nation (6)
3. Visit second person? Goodbye! (3,3)
4. Sixth sense about ship with hole, makes strong drink (8)
5. Saucer on board for roaming cats (6)
6. Acquired this in Latin cathedral style (6)
7. Mid-western state a banker's resort (8)
8. Take public transport to famous loch without me for company (8)
9. Had PC eat cooked fungus (with fatal consequences?!) (8)
10. Stand up with ease for Porter in Macbeth, for example (5,6)
11. Immigration agents starting trouble in Manhattan detail (6)
12. Nothing constant, no identity - making Fentanyl, for example. (6)
13. No case lost, unless thrown overboard into these? (6)