Salary once I'm working (6)
I believe the answer is:
income
'salary' is the definition.
(I've seen this before)
'once i'm working' is the wordplay.
'working' indicates an anagram.
'once'+'im'='onceim'
'onceim' anagrammed gives 'INCOME'.
(Other definitions for income that I've seen before include "Returns" , "What do you make" , "Wage" , "Money from investments or for work" , "Money gained from work or investment" .)