Crossword puzzle clue "something seen after hours"

Something seen after hours?

Feeling that you've seen something before seen something before

Something often seen on a street corner, briefly ... or, literally, something seen in each corner of this puzzle

Only driver to win the Indianapolis 500, the Daytona 500, the 24 Hours of Daytona, and the 24 Hours of Le Mans

Group seen in late-night hours?

Stare at a rose for six hours because you've never truly seen a flower before until now

Something mild after something hard

"Something a teenage boy can do for hours at a time." The survey did not say (but a contestant did): "___"