Rte 4

[scooke]

18a sss...hhh! make a sound and the ice will melt, so to speak5,3,7)???a,???,?I???c?
23d poker stoker with a diamond hand?(3-3)
26d mark well, as mark antony might have put it(4,4)??n?,??r?

[Captain2]

Break the silence

[chelle7272]

18 Break the silence?

[JJ109]

Break the silence ?
Red Hot ?
Nota Bene ?

[chelle7272]

26d 'mark well' in latin is nota bene but your letters don't fit

[Captain2]

Lend ears?

[fiction-factory]

lend ears will be right as it comes from the 'Mark Antony' quote in the Shakespeare play. I'm not sure of the 'mark well' bit of the quote except I suppose both mean 'listen up'

[ducksie]

Chelle and jj109 were correct with Nota Bene, scooke has not provided you with correct letters
Should this q come up again, the q to 9ac is:
...the one in charge who should be charged above all.. (10) RingleadEr
(the 1st E in Bene) 11ac Out for a spell, please disturb (6) AsleEp, second letter of Bene and anag of asleep

great guesses though on Lend Ears - when the clues are not in front of you

answers for clues ac to give Nota are: iNkind and aT the gates 25 & 28ac

[ducksie]

meant to be anag of Please, not asleep...tsk

[fiction-factory]

Thanks ducksie. It's a bit puzzling as your letters E and N seem to be/cross in different places than the N and given in the OP

[ducksie]

FF, the clue is a two bit clue, 26d and 7d the 3rd letter in 7d is E not n as scooke shows, the 26d part of the clue is nota - I don't know where scookes letters are coming from but I would never had made sense of it had I not completed the crossword myself earlier