Nostalgic feelings when head lost income (8)
I believe the answer is:
earnings
'income' is the definition.
(earnings is a kind of income)
'nostalgic feelings when head lost' is the wordplay.
'nostalgic feelings' becomes 'yearnings' (nostalgia is a yearning feeling).
'when head lost' means to remove the first letter.
'yearnings' with its first letter taken off is 'EARNINGS'.
(Other definitions for earnings that I've seen before include "Profits, incomes" , "Wages for grannies" , "Moneys received for grannies" , "Profits from a venture" , "Monies obtained in return for labour or services" .)