Income for poor grannies (8)
I believe the answer is:
earnings
'income' is the definition.
(earnings is a kind of income)
'poor grannies' is the wordplay.
'poor' indicates an anagram.
'grannies' anagrammed gives 'EARNINGS'.
'for' is the link.
(Other definitions for earnings that I've seen before include "Monies obtained in return for labour or services" , "Money gained in work" , "Wages for grannies" , "Profits from a venture" , "Salaries, wages" .)