Stoppage of tram maybe ill-starred, involving 1Ac (7,6)

I believe the answer is:

cardiac arrest

'stoppage' is the definition.
(someone's heart stopping)

'tram maybe ill-starred involving 1ac' is the wordplay.
I cannot really see how this works, but
'tram' could be 'car' (I've seen this in another clue) and 'car' is located in the answer.
'1ac' could be 'ac' and 'ac' is present in the answer.
This explanation may well be incorrect...

'of' is the link.

(Another definition for cardiac arrest that I've seen is " Stoppage of the heart".)

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