Mine is worried about company pay (6)
I believe the answer is:
income
'pay' is the definition.
(thesaurus)
'mine is worried about company' is the wordplay.
'is worried' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'company' becomes 'co' (abbreviation).
'mine' with letters rearranged gives 'inme'.
'inme' going around 'co' is 'INCOME'.
(Other definitions for income that I've seen before include "Wage" , "Remunerations, takings" , "Money received on which tax is payable" , "See 12" , "Returns" .)