5d: Track is definition, with or added to the word it's a word for a kind of sewer, daily roll the definition, a height going upward.
4d: Definition is plural of a kind of car, an anagram.
Thanks aristophanes. I've finished now. I had a wrong answer which stopped me seeing the obvious with the thematics.
I don't see why the 4d definition is 'auto-assemblage'; and can't parse 7d left either.
Otherwise all good!