Pay mice no differently (6)
I believe the answer is:
income
'pay' is the definition.
(I've seen this before)
'mice no differently' is the wordplay.
'differently' indicates anagramming the letters.
'mice'+'no'='miceno'
'miceno' is an anagram of 'INCOME'.
(Other definitions for income that I've seen before include "Salary" , "Money gained from work or investment" , "Money from investments or for work" , "Pay earned" , "Earned or unearned revenue." .)