Stuck with the last 2 clues. Help will be great appreciated.
13d Old artists and conservatives have kitchen gardens(9)
O?i?o???s
24a Before, the French measure short dress( 6)
???n?e
Special instructions: 2 letters in the Solution from the wordplay need to be substituted ( 1 or 2 chemical element(s) by another) before entry in the grid.