Crossword puzzle clue "one might end with org"

One might end with .org

"I'm the beginning of eternity, the end of time and space, the beginning of the end, and the end of every place ..."

You might close one at the end of a long night

Fans might wave one at the end of a playoff series

A rear-end collision might cause one

One who might receive roses at the end of a performance

One might end "Sent from my iPhone"

A retirement party might toast the end of one