23a Seize a vehicle with an automatic starter in district of 22 across (Brazil) (10). possibly ???a?a?a?a. Can it end in ...acarana?
25a City in 22across thus following a piece of opera(6) (???o?o) I suspect this ends in ...oso
Also, is 5 down baking soda? If so, I don't quite understand the wordplay. Any more help with the top righthand corner would be welcome, tho I think 9a is amazon.