Crossword Genius

Walker appearing late? (5)

Ross

I believe the answer is:

ghost

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'walker' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ghost that I've seen before include "Spectre, wraith" , "who has a haunting act?" , "Apparition; faint trace" , "Author, secretly" , "author for someone" .)

I've seen this clue in the Evening Standard.
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