Crossword puzzle clue "something to write on"

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

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

It may be used to write down a write-off

Write something, even if not the final draft

Invisible ___ (something a spy might write with)

Something to write with

Something your poetry teacher might assign you to write about a particularly inspirational poetry teacher you've had *hint* *hint

Something to write on