11a- A mixture of cooked meat or fish and veg in a sauce used as fillings for pastries etc (8) 17a- relating to an ancient celtic alphabet of straight lines meeting or crossing the edge of a stone(7) 19d-A cusp or stationary point of a curve in geometry (7) 24d An alloy of iron,nickel, and carbon expanded by heat used in the making scientific intruments (5)
24d Invar ? .. an alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments