Phantom or visitant (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
ghost
(Other definitions for ghost that I've seen before include "Lay down life for another in this" , "Writer who gives the credit of authorship to someone else" , "Apparition; faint trace" , "Pen for another" , "Hamlet's spectral father" .)