Answer: interlined

AnswerCrossword Clue
INTERLINEDReinforced for warmth.
INTERLINEDMade changes on copy
INTERLINEDWritten between two rows of text
interlinedInsert (words) in this way
interlinedINTERLINE, to write or insert between lines already written or printed, as for correction or addition
interlinedInsert words between the lines of (a document or other text)