I'll give you the definitions of two shorter words. You just need to add them together to make one longer word. All these longer words begin with the letter Q.
-1.One fourth + That which is last. 12 letters
-2.To give up + A demand for something as rightful or due. 9
-3.An open pit from which stone is obtained + Adult male. 9
-4.A knights search + An atom that has gained or lost an electron. 8
5.A writing pen made from the shaft of a feather + St Johns plant. 9
-6.Prefix meaning four + To speak in a wild and vehement manner. 8
-7.Very fast + Sedimentary material on the beach. 9
8.Female sovereign + Physical dimensions. 9
9.An argument + Not all of. 11
-10.Fifth + Absolutely necessary. 14