Cryptic crossword No 3,829

Across

1. Folding over recipe (Nigella's second), add final bit of seasoning: taste without hesitation! (7)
2. Ostentatious politician tries intimidating Congress at first - what a nerve! (5)
3. Award brother initially preventing hostile invasive lake species that loves the rain (9)
4. Hurried party member with a final drink at last leading to a drunken way home? (6,4)
5. Initially lacking PA system, Vice-President blows his top in irritation (9)
6. At the core of record childish conflict, there's a standoff (4,3)
7. Possibly supplement docked calculus marks, getting one over university lecturer (7)
8. Stores memo adapted for analysing solutions (10)
9. Cop put homicidal lunatic in secure containment (10,5)
10. Researchers occupied with organ (3)
11. Cheap ricotta covering fruit (7)
12. Space uniform for Australian (3)
13. Get used to hurt - there's no justice! (5)

Down

1. Found at the top of an orange shirt? (8,6)
2. Idle talk of old Panama with the Spanish supporters (8)
3. Unknown American promoted old party, mostly for Swift? (6)
4. Novice in heavy metal band becoming leader of Television and Survivor (6)
5. Go where Henry I goes (6)
6. Herb circles round president (7)
7. Chant when mixing hemp with mud and ammonia (2,4,5,3)
8. Silicon Rat?! (13)
9. Tristan's partner confesses dealing drugs (6)
10. Fish and chop up catch (7)
11. Article inspired by hit LP sold the most ever (4,3,6)
12. Magnificent team delivered top quality (5,3)