No trickery here - just ten 'cons' that need another word after them to make them 'long cons'.
-1.CON + going down = patronizing.
-2.CON + an arrangement = outcome.
-3. CON + guide = consider.
-4.CON + not permanent = present-day.
-5.CON + established = bewildered.
6.CON + organisation = alliance
-7.CON + farm vehicle = builder.
8.CON + a helping of food = using frugally.
-9.CON + testimonial = chip in.
-10.CON + horse's home = police officer.