Deity takes nothing to be beneficial (4)
I believe the answer is:
good
'beneficial' is the definition.
('good' can be a synonym of 'beneficial')
'deity takes nothing' is the wordplay.
'deity' becomes 'god' ('god' can be a synonym of 'deity'**).
'takes' indicates putting letters inside.
'nothing' becomes 'o' (looks like zero - 0).
'god' enclosing 'o' is 'GOOD'.
'to be' is the link.
(Other definitions for good that I've seen before include "(Of child) well-behaved" , "Moral excellence" , "Having desirable qualities" , "Carol character from 1 as of old" , "Virtuous - valid" .)