Shelter a poor area bringing in yen (6)
I believe the answer is:
asylum
'shelter' is the definition.
(asylum is a kind of shelter)
'a poor area bringing in yen' is the wordplay.
'poor area' becomes 'slum'.
'bringing in' indicates putting letters inside.
'yen' becomes 'y'.
'slum' enclosing 'y' is 'sylum'.
'a'+'sylum'='ASYLUM'
(Other definitions for asylum that I've seen before include "Institution for care of the insane" , "Refugee's protection" , "Place of refuge, once a mental institution" , "Place of shelter or refuge" , "sought by immigrants" .)