Words within words' series. Enjoy.
-1.CON + To have dispatched a letter = Permission. 7 letters
-2.CON + A word to describe someone of low intelligence = To change from a gas to a liquid. 8
-3.CON + The location of spelunking = Curved inwards. 7
-4.CON + To go down (stairs) = To talk to someone patronizingly. 10
-5.CON + The place where tears come from = To allow heat to pass through. 7
-6.CON + A mission to achieve a specific goal = The process of taking over a new territory. 8
7.CON + The line leading to explosives = To mistake one person for another. 7
-8.CON + The side of an object which faces forward = To challenge what someone is doing. 8
-9.CON + Resistant to pressure being applied = To verify the truth in a statement. 7
-10.CON + To charge money for damages = To keep in an enclosed space. 7