ATC clearance to land followed by request to extend downwind
Hi there,
I'm working toward my PPL and today just prior to entering the pattern, I received clearance to land at KPAO. Then, abeam the numbers I was asked to extend my downwind to accommodate other traffic and told that ATC would call my base. On final I made two requests for verification of clearance before deciding to go around although the active was clear. If there's a doubt, there's no doubt, right?!
My question is, was my clearance to land always valid or was in fact invalidated by the revised sequence?