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I'm brain dead on last four:
13A My man will ring in two secs (5,5). H---S/-E---
10A Singing siblings- born singing siblings, we hear (8)
--V-R---
3D Tone down supporting instrument extreme in volume (4,4). -A--/---E

Finally, for 24A Comforting mug picked up in Gabon(10, I have succouring but I can't parse it.
Help!

hells bells

b everlys

Sax- instrument + e (extreme letter in volume) + Blue - down - Saxe Blue - a tone?

Mug - sucker - picked sounds like- succour + in + g for Gabon? (int no plate mark)

sorry cym gotta go - think the next one could be "navy blue" haven't a clue how tho'

posts crossed ab

Thanks, everyone.