The <clock> element is a stimulus just like any other (<text>, <picture>, etc.). To actually display it, you need to include it via the <trial>'s /stimulustimes - or frames.
/ ontrialbegin = [clock.timer.start(0)]
/ stimulustimes = [0=wait, timer]
/ validresponse = (57)
/ inputdevice = keyboard
/ responseinterrupt = immediate
/ trialduration = 60000
/ pretrialpause = 250
/ posttrialpause = 250
> Also I am having issue skipping through the "Wait" block; "ctrl-b" doesn't work for some reason.
There is no wait *<block>* in the code you provided. There is only the wait *<trial>*. Hence I cannot speak to the issue. You cannot, however, skip a <trial> using CTRL+B, since a <trial> is not a <block>.