Crossword puzzle clue "leading man now and then"

Leading man, now and then

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

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

"Paddington 2" actor who says, "I'm too old and ugly to be the young leading man in romantic comedies now, thank God": 2 wds.

Exams that used to go up to 1600 and then 2400 and now I can't keep track: Abbr.

Do this, then that, then this again

Place whose population was 1, then 2, then 0

Back then, back then