Crossword Genius

Headless spirit is beyond a shadow of doubt still open to question (12)

Ross

I believe the answer is:

inconclusive

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'headless' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for inconclusive that I've seen before include "not getting any results?" , "not settled" , "Not giving a clear result" , "Not leading to a firm result" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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