Can a Clydesdale jump

Answer 1

No.

EDIT:

It really depends. A full-blooded Clydesdale is unlikely to be a good jumper, as they are heavily built and very compact. They are made more for pulling weights and using their strength for working. However, when crossed with Thoroughbreds or Warmbloods they make very good cross-country horses as they are big and strong, but also have the speed/leanness of a competition horse. New Zealand, my country, has a breed called the "Stationbred" which is largely based on Clydesdale and Thoroughbred blood. Horses from this breed are bold and definitely look Clydie (they often have white faces, large leg markings and plenty of feather). The Clydie influence gives them the size and strength necessary to make good hunting horses.

Answer 2

yes, any horse can be trained to jump