Crossword puzzle clue "now then connector"

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

Now-then connector

1950s-'60s hit with the lyric "Ah, you made me love you / Now, now, now, now your man is come"

Do this, then that, then this again

Place whose population was 1, then 2, then 0

Back then, back then

"First I'll read, then watch the movie, then..."

Entering your middle name, then date of birth, then adding a "1," etc.?