Seldom seen in poorer areas (4)
I believe the answer is:
rare
'seldom seen' is the definition.
(something seldom seen is seen rarely)
'in poorer areas' is the wordplay.
'in' indicates a hidden word.
'RARE' is hidden in the letters of 'poorer areas'.
(Other definitions for rare that I've seen before include "difficult to find?" , "Infrequent; remarkable" , "Not easily come by like undercooked meat" , "little done?" , "Scarcely seen" .)