Tricky... simply setting the pin to Output could clash with whatever external circuitry you're using to drive the Clock. Obviously what Microchip wants you to do is not toggle the pin, that will naturally stop the PICs internals from doing their thing. If you have a pull-up on that pin, pulling it to 0v will start drawing current... a little more thought is needed as to what how and where before a decision is made on this one.