I don't usually have many problems with a Mudd offering but can barely get started. These would help
5d Elected, a Conservative minister likely to be eviscerated wrongly (12) No letters [Doesn't bode well when you have to look up what eviscerated means!]
11d Double trouble around people almost despairing over Greek capital
(12) No letters
18a Amid awful dread, European queen ending in ecstasy -happy occasion (3-6 ,3) I want it to be red-letter day. Red and da coming from dread and y being the end of ecstasy but I don't think there is a Queen called Letter.
21a 100cm OK to be cut off (10) No letters