Crossword puzzle clue "write out fully"

"To write is to write is to write . . ." writer

Write out fully

He sang (but did not write) "I Write the Songs"

It may be used to write down a write-off

Write out of one's will, perhaps

Feeling you get when all your friends are out having fun but you have to stay in and write clues for a crossword puzzle :'(

Number that's physically impossible to write out in standard form

Fully engulfed, perhaps