I was on the POU GPS-24 (http://204.108.4.16/d-tpp/0508/00286VDG24.PDF),
full procedure, Kingston IAF. We were IFR, in and out of IMC. We had been
cleared for the appoach, which was loaded and executed in the GPS. We were
on a heading of roughly 180 to IGN, and about a mile from the VOR, when the
controller said something like, "I need to you to stay at 4000 and keep
tracking outbound for a while for traffic below you". I agreed to do so
and turned to a 060 heading.

At this point, things started going downhill. I suppose, technically the
controller committed an error. He had already cleared me for the approach,
but then gave me instructions contrary to the procedure. I was in a sort
of half-way place between flying the full procedure pilot nav and being on
vectors. Better to have just canceled my approach clearance and given me
vectors to avoid the traffic then back around for a fresh start.

During my instrument training, I had a final checkout with the chief
flight instructor before my checkride, and one of the approaches we did
was this exact approach. And funnily enough, I remember getting a very
similar "cleared for the approach", followed by "stay at 4000 for
traffic". Unluckily for me, the controller forgot about us, and when we
were eventually cleared down to 2900, it took _forever_ for us to get
back to the airport because of some really strong winds that day (which
nearly caused me to be sick once the checkout was over!) So whenever I
fly out that way these days, I always try to stay on top of the
controller... the days where'd I'd be patient and wait for them to get
back to me are long since past.

--
Guy