Wants, requires (5)
I believe the answer is:
needs
This clue is a double definition.
'wants' is the first definition.
('need' can be a synonym of 'want')
'requires' is the second definition.
('need' can be a synonym of 'require')
(Other definitions for needs that I've seen before include "Can't do without" , "Things that are wanted" , "shopping-list, say" , "Necessitates" , "Requires or lacks" .)