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 U.
-1.Beneath or below + Domesticated canid. 8 letters
-2.A stimulant drug + To sever with a sharp instrument. 8
-3.Sore on the skin or a mucous membrane + Consumed food. 8
-4.Somethings purpose + Smaller amount. 7
-5.Feeling of restless agitation + Water having fallen from the clouds. 12
-6.To express ones self with words + Greatest quantity. 9
-7.Excessive or extreme + Last colour of the visible spectrum. 11
8.Not down + To plait three or more strands together. 7
-9.Mother's brother + Indefinite article before a word beginning with a vowel. 7
-10.Me and you + Not him. 5