Good afiernoon, One Across.
22ac. Anagram (doctored)of "ready", surrounding "a g"(overnment) - meaning a measure.
I think you've missed out a bit of the clue for 3d. (mine is posted, so I can't check!).
Answer means "to view"; synonym of "of course", around Roman numeral for 5, followed by finish (last letter) of Derby.
Hoping this helps!
Al Issner