When does the clock start? (NF)

[whaddayouknow]

The clock should start on the ready if the action which caused the down to end did not cause the clock to be stopped.

In the play mentioned here, I believe that this was not a change of possession, so the clock would have been started on the ready if there had been no penalty. Subsequently, after the penalty was enforced, I believe the clock should still begin on the ready.