Relations in street unable to spend any money? (5)
I believe the answer is:
skint
'unable to spend any money?' is the definition.
'relations in street' is the wordplay.
'relations' becomes 'kin' (I've seen this before).
'in' indicates putting letters inside.
'street' becomes 'st'.
'kin' put into 'st' is 'SKINT'.
(Other definitions for skint that I've seen before include "Stony-broke" , "bust" , "Stony broke" , "Informally, having no money left" , "Without money (slang)" .)