Some Jews in Shia novel about police department (7)
I believe the answer is:
hasidic
'some jews in' is the definition.
The definition suggests an adjective which matches the answer.
'shia novel about police department' is the wordplay.
'novel' indicates anagramming the letters.
'about' shows that the letters should be reversed in order.
'police department' becomes 'cid' (I've seen this in other clues).
'cid' written backwards gives 'dic'.
'shia' anagrammed gives 'hasi'.
'hasi'+'dic'='HASIDIC'
Can you help me to learn more?
(Other definitions for hasidic that I've seen before include "Of a very pious Jewish sect" , "of religious adherents" , "Of a strictly orthodox Jewish sect" .)