I'm with Clydesdale bank in the uk when will it be supported by Apple Pay ?

Hi

This is a user-based technical support community, so no-one here can tell you about Clydesdale Bank's or Apple's unannounced plans (whether, when, etc). Your best solution is to keep checking the list of participating banks for the UK:

http://www.apple.com/uk/apple-pay/

If you are keen to see Clydesdale become a participating bank, you can let them know directly:

http://www.cbonline.co.uk/contact-us/