Crossword puzzle clue "stops from having a period perhaps"

Stops from having a period, perhaps?

Hybrid car that runs a few seconds, then stops, then runs again, then stops again...?

Stops after ERs, perhaps

Surfers' stops, perhaps

Like either option in "Would you rather watch a video of your parents having sex or your parents watch a video of you having sex?"

Period of instability, perhaps

Deal with one's period, perhaps?

Period associated with a president, perhaps