Telegraph Toughie

[Chaseman]

Last two to get and they end with same letter

27a Additional comment by unknown revolutionary soul

_ S _ C _ _

Look like Psyche. A PS is an additional comment and psyche is the soul but can't see the rest

20d Imagine the setter [Warbler] had worried interminably

_ D _ A _ _

If Psyche is right then it ends with an E

[dannyk13]

27a.Psyche
20d.Ideate

[Chaseman]

Thanks Danny but I can't see why. 27d Where's the unknown revolutionary?

20a I can see that imagine produces "idea" but where does the setter come in and why is he worried??

[dannyk13]

27a. Ps(additional comment) + y(unknown) + che(Guevara)
20d; I'd eate(n) the setter had worried

[Chaseman]

Thanks Danny. So the letter "y" means unknown in crossword parlance?

[dannyk13]

In mathematics x y & z can be unknown quantities.