Crossword Genius

Gloomy doctor relays conclusion to patients (7)

Ross

I believe the answer is:

rayless

'gloomy' is the definition.
(without a ray of light)

'doctor relays conclusion to patients' is the wordplay.
'doctor' indicates an anagram.
'conclusion to' suggests the final letters.
The last letter of 'patients' is 's'.
'relays' is an anagram of 'rayles'.
'rayles'+'s'='RAYLESS'

I've seen this clue in The Guardian.
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