[Alexander K]

The manual doesn't lie.
The selection comes first, then one can move the playstartmarker to the desired position. It doesn't work vice versa.
That's the way it was in PT9. But since PT10 the playstartmarker doesn't go to the start of a clip when the clip is selected entirely with the Smart tool. This behaviour has changed without notice. So it's probably a bug.

At the moment it happens all the time that by selecting a clip, the playstartmarker stays somewhere else (outside the selection). That behaviour doesn't help in editing and isn't described in the manual.