Guardian Genius 45

[Aperio]

I have come to a grinding halt in the top left of this crossword. None of the letter combinations I try seem to work. Can someone tell me if my check letters are correct? Is 20ac FOXIER? Is 13ac RENDER?

Many thanks Aperio

10 dn) Prison for student in fighting - uhat he uent for? (8) ??U??LA?
17 ac) Dr Gardener starts to get cold (7) ??CHILL
20 ac) River in Uilts or Dorset? One is not so artless (6) ???IE?
13 ac) There is one - not all of it the translation (6) ??NDER

[GetOverIt]

Sorry - I looked at the pre-amble and the barred grid - and the crossword has sat in my " to do " pile for the last three weeks- hope you get some help tomorrow.

[Dalek]

10d - jugular written in Auricaria language as giugular
17a - jekyll - written as gechill
20a - wilier - written as uilier
13a - yonder - written as ionder

[Aperio]

Many thanks Dalek. Aperio