Income range is not initially changed (8)
I believe the answer is:
earnings
'income' is the definition.
(earnings is a kind of income)
'range is not initially changed' is the wordplay.
'initially' indicates taking the first letters.
'changed' indicates an anagram.
The first letter of 'not' is 'n'.
'range'+'is'+'n'='rangeisn'
'rangeisn' anagrammed gives 'EARNINGS'.
(Other definitions for earnings that I've seen before include "Proceeds" , "Monies obtained in return for labour or services" , "Salary" , "Moneys brought in for grannies" , "Pay" .)