Argues children should receive bill, perversely (7)
I believe the answer is:
debates
'argues' is the definition.
('debate' can be a synonym of 'argue')
'children should receive bill perversely' is the wordplay.
'children' becomes 'seed' (I've seen this before).
'should receive' is an insertion indicator.
'bill' becomes 'tab' (a tab is a bill at a bar).
'perversely' says the letters should be written backwards (in the converse or wrong direction).
'seed' placed around 'tab' is 'setabed'.
'setabed' back-to-front is 'DEBATES'.
(Other definitions for debates that I've seen before include "Discusses" , "Formal discussions" .)