Making a positive edge clock pulse with a button?
A single clean pulse can be created using a latch circuit, (cross coupled gates).  Ideally this works best with a switch or push button having a SPDT format.  

Another option is to use a SPST switch with (debounce) filtering which is basically an RC filter followed by a Schmitt trigger circuit.

One more idea is a one shot circuit using a chip such as a 555 series timer. With a 555 design you can even set up the desired pulse width. 

Here is a Google link showing several of the above mentioned designs:
https://www.google.com/search?q=switch+debounce+latch&amp;biw=1174&amp;bih=600&amp;source=lnms&amp;tbm=isch&amp;sa=X&amp;ved=0ahUKEwir_tSHvpDLAhWE5iYKHWoLCM8Q_AUIBigB#imgrc=_