Employing, expending (5)
I believe the answer is:
using
I believe this is a double definition.
'employing' is the first definition.
(to employ is to use)
'expending' is the second definition.
('use' can be a synonym of 'expend')
(Other definitions for using that I've seen before include "Exercising" , "Employing" , "practice" , "taking drugs" , "addiction" .)