1 across: Is radio carried by explorer in halter? (4, 5)
Halter = disc brake. The rest?
5 down: Cosmic cutie came to end before start (4)
RC called it early as ewok = cosmic cutie. What we never managed to work out is an explanation.
6 down: Bloke getting there when four escape tangled scrub (9)
I kind of cheated on this one by looking up the dictionary to get scrub = chaparral. Bloke = chap is obvious, the rest not so.
11 across: NZ author fixed habit with heroin reserve (4, 4)
NZ author = Ruth Park and reserve = park, but how can fixed habit with heroin = ruth?
19 across: Hungarian scorer’s tip for audience? (5)
Liszt = Hungarian, but how does the rest work?
21 across: RAF shell wounds wet Sendero Luminoso fighter (5)
Sendero Luminoso fighter = Maoist, but that’s all I’ve got.
28 across: Increase tenfold the gist of legal restriction (5)
We figured that restriction = limit, just that we had no explanation for it.
14 down: Guards causing endless ruckus about … revolt (10)
I got guards = custodians from the cross clues. I had no explanation for it, though.
23 down: Pontoon, perhaps, reaches sailor on the Persian Gulf (5)
RC again called it early with on the Persian Gulf = Qatar. While sailor = tar is easy enough, how does pontoon, perhaps = qa?
2 down: A long way for A-listers to go? (7, 4)
The Saturday Age says stretch limo, just that I don’t even know what the direct clue is.