Last three:
1a A number get away with swindle (6) D???A?
8a Capital investments for in the 18th century (7)
?O???P?
2d Food for cattle in Switzerland (7) ????R?E
Any pointers appreciated
In 1 across, Crackabilly, could your "a" be wrong?
A "d", maybe?
D is a Latin number and with a word for get away with, would give a word for swindle or con.