Guardian Cryptic 26,715

[Neily]

Very grateful for all help with these four clues.

5dn: "On the ground, it's felt a number had retreated (6)." I have N-M-A-.
8dn: "The sailors -say 50 seemingly -leave the last one stranded (6)." I have -R-S--.
10ac: "Could be one of 49 or 50 - Boatman's wiser, at last? (4,5)." I have G-L-,M-N-R.
13ac: "Whether to help, perhaps? Yes, most of the time that's best (4,6)." I have --U-,C-O-C-.

[sandyRoe]

8 Crusoe

[Tilly2]

13 ac good choice

[Psybbo]

13 your choice?

[Calibax]

10a Gold Miner?

[Calibax]

5d Numdah

[Calibax]

^^ 10a if "Boatman" is the setter
Gold miner ('49er)
Gold (50) + mine (Boatman's) + (wise)r

[Tilly2]

Better answer than mine, Sibs. ;o

[Neily]

Thanks for these helps. So what do they make the answer to 7dn: "50% of USSR rejected mysterious perestroika (6)." I have -O-E-Y. And what about 15ac: "Some 50%,say, of what you're reading (4)." I have -Y-E.

[Psybbo]

15 type?

[scorpiojo]

Moiety - mysterious minus USSR

[Psybbo]

Moiety

[Neily]

MOIETY is fiendish!!! Many thanks all.

[Mamyalynne]

Isn't it, not every week you see that word used as an anagram indicator.