One of those in police station has not been processed - it's a concern for those who think the spooks are involved (12)
I believe the answer is:
supernatural
'one of those in police station has not been processed it's a concern for those who think the spooks are involved' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'not been processed it's a concern for those who think the spooks are involved' is the wordplay.
I cannot quite see how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is located in the answer.
'not' could be 'un' (prefix meaning 'not') and 'un' is found in the remaining letters.
'been' could be 'sat' (sitting is a kind of being) and 'sat' is found within the leftover letters.
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is located in the answer.
The remaining letters 'url' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for supernatural that I've seen before include "Miraculous, magical" , "Not of this world" , "outside the known law?" , "unknown to science" , "Mysterious" .)