Some Paris luminaries in poor part of city (4)
I believe the answer is:
slum
'poor part of city' is the definition.
(a slum is an impoverished area)
'some paris luminaries in' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'SLUM' is hidden within 'paris luminaries in'.
(Other definitions for slum that I've seen before include "Squalid, overcrowded dwelling" , "Poor-quality accommodation" , "Run-down housing area" , "Squalid neighbourhood" , "Area of poor housing" .)