28 across: Super-duper car is Matt’s Rolls? (4, 6)
Super-duper was suspiciously odd; we had realised that. Yet by the time we had surmised that it was probably an anagram clue where car is Matt’s Rolls = super-duper, we were over the DA and checking the answers. It took a moment to sink in, and it was enjoyable when it did — super-duper = scam artist (as in someone who dupes) is quite funny.
2 down: Heckler yelled “Coffee!” (5)
An auditory and double-meaning classic! Heckler = mocker so that heckler yelled = mocha = coffee.
7 down: Desert queen to sea-monster, say, below treacherous rip (9)
The movie was great; so was this clue. Sea-monster = scylla (from The Odyssey), sea-monster say = scilla and treacherous rip = pri, which gives sea-monster, say, below treacherous rip = priscilla = desert queen.
3 down: Thus drinking during break, one left wine cocktail (9, 5)
Thanks to AL, we can give this quality clue its due. Here, thus = so, during break = in gap, thus drinking (as in consuming, which is another inventive DA containment indicator), during break = singapo, wine = riesling and one left wine = resling, all of which gives thus drinking during break, one left wine = singapore sling = cocktail.
16 across: Setter gettin’ high from hallucinogenic?
This fine clue I dedicate to Hunter S. The penny dropped here when considering the oddity of gettin’ and concluding that this hallucinogenic probably ends in in. Mescalin immediately came to mind, and then so did the explanation: setter = me and gettin’ high = scalin’, giving setter gettin’ high = mescalin = hallucinogenic.