Crossword puzzle clue "starting code word"

Starting code word

Starting a project ... and what the letters between the starting and ending pairs of letters in each starred answer are doing?

Starting letters in military code

No. starting with an area code

Secret code, in the secret code

Code hidden in a bar code

Part of a magician's starting word

Flagmaker Ross (and, starting on the T, an 11-word quote that "runs" diagonally through the grid)