Grannie's poor remuneration (8)
I believe the answer is:
'remuneration' is the definition.
('earnings' can be a synonym of 'remuneration')
'grannie's poor' is the wordplay.
'poor' is an anagram indicator.
'grannies' is an anagram of 'EARNINGS'.
(Other definitions for earnings that I've seen before include "Salaries etc" , "Income from work" , "Pay" , "Returns received for work" , "made money" .)