Crossword puzzle clue "next in command often abbr"

Next in command, often (abbr.)

"Execute my command," as often spoken by Captain Picard on "Star Trek: The Next Generation"

"Play next" command on a music app

George's next-in-command

Picard's second-in-command, on "Star Trek: The Next Generation"

Prez's next-in-command

Following a command hidden in this answer, convention handouts; following the command another way, one flaunting their friends

Command-Z command