I 2055

[dreamer56]

2 down Fuel component in McLaren vehicle combusted at once (6) -C-I-E ( though I am not sure of the 'i')
4 down Over time cynic becomes Tea Party member. (6) -A---R
7 down University student holds bottles of Becks (8) -I---E-S
24 ac Panda possibly caught chill before visiting Arctic Circle (6,3)
Many thanks in advance

[cashier]

2. Octane. Anag at once

[dannyk13]

2.Octane?

[dannyk13]

Police car

[cashier]

4. Hatter hater with t inside

[dannyk13]

7d.Rivulets

[dreamer56]

Thanks Danny13 and Cashier
6 down Grey like the outskirts of Hinckley(4) I had 'ASHY' but that feels awful.
12 ac Fat chance of this (5,4) T---Y -U-K
The 'Y' is from 'ashy' but I'm thinking 'Tough luck'

[dannyk13]

AShy looks good- As(like) + H(inckle)y

[dannyk13]

Tummy tuck?

[dreamer56]

many thanks!
Yeah, the ASHY looks right. So Tummy tuck works-'FAT?...chance of this'. I was fixated on 'fat chance'!