2: Daytime 8-down repelled Marx (5)
3: Belated top-and-tailing to gladden one's heart (5)
5: It's on the coast of Australia - a tree discovered by science (6,3)
6: Poked with a knife, one cat finally howled outside (9)
7: Canadian water ordered for regal tea-break (5,4,4)
8: Guess what the benighted marksman did? (4,2,3,4)
11: Call initially communicates real yearning (3)
16: Unnecessary oath from ex-president I've allowed in (9)
17: Immediately placed in an awkward situation (2,3,4)
24: Plan to return with woman (3)
26: Loathing for leader leaving platform (5)
27: Ensemble originally formed with ocarina, cello, theremin, euphonium, and tabla (5)
28: Tender translator of runes (5)