18 down: Leave cold cash for audit in wine region (8)
Bordeaux = wine region, but the closest I could get to the rest of the clue meaning the same is that cash = dough which sounds like deaux.
30 across: Sly one gutlessly rejected 22-down (player) as unknown influence? (1-6)
Unknown influence = x-factor, player = actor, but how sly one gutlessly rejected = xf is beyond me and TH.
21 across: Precious lot in NT kinda marginalised (twice) by outspoken party (6)
Kinda marginalised (twice) = kaka, and from that it’s pretty easy to get precious lot in NT = kakadu, but how does that du come about?
2 down: Virus upset a sleeper’s position (5)
Here, virus = ebola. I have nothing else, however, to offer.