Interesting: I had never come across that meaning for the word previously, so now I feel a little better about being completely stumped!

Same here! I still don't completely understand the solution.

W (with) + i (1) + dow (down almost) = widow, apparently meaning a short last line in printing

Aaaaah, a Denisian cryptic. Thank you, Lex.

...and good work by mxm in cracking it (as I am sure he has although of course we await Cheryl's confirmation)

And, widow it is! Great job, manxman! ===[**CDM**]===

Sue, it reminded me of Denis as well.

(a Denisian cryptic) Very funny Sue.

Thank you Sherlock

Bird's egg in roll (7)

one 'e'

cvvccvc

ro(o)ster

Good answer Sherlock ===[**CDM**]===

Thank you muchly, manxy!

Keep it: a phrase covering words written in stone (7)

Epitaph = words written in stone, hidden word (from the mistress of the genre!)

For winning this belt your name will be written in stone, Lex! ===[**CDM**]===

Thank you, although I'm not sure I'm ready for my name in stone just yet...!

Novel virus found in bones, unknown in the past (6,7)

Direct on the left, no e

Doctor Zhivago (solved by me, explained (the hard bit) by Mrs Worrier!)

Virus is 'hiv'
Bones is 'doctor' - she's a fan of the original Star Trek (can't imagine why...)
In the past is 'ago' (my humble contribution)
and 'z' is a (mathematical) unknown.

Nice one, Lex!

Congratulations to both: ===[**CDM**]===

That one came from a Financial Times puzzle (now our regular lunchtime brain training except for the Saturday Telegraph)

Thanks, Lex! One from Mrs W:

Wise guy finds potassium without a barrier (4-3)

Early hints:

Direct on the left
Wordplay 1 + 2 + 4
ccvc-vcc
"finds" is merely a link word to improve the surface
"potassium" now spelt correctly

k/no/w-all

That's the one, Cheryl! ===[**CDM**]===

Thank you kindly, Rog!

Reverse-color pictures, for example, taken by locals (9)

Direct on the left. 2 e's