Tripe can be eaten in cars! (3)
I believe the answer is:
rot
'tripe' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rot that I've seen before include "'Decay, decompose (3)'" , "Deterioration" , "Putrefy" , "Decay, wither" , "Decay or disintegrate" .)