Function (3)
'function' is the definition.
(something's use is its function)
This is the entire clue.
(Other definitions for use that I've seen before include "Avail oneself of" , "Bring into play" , "Put to a particular purpose" , "Benefit" , "Habitually employ" .)
'function' is the definition.
(I know that function can be written as purpose)
This is all the clue.
(Other definitions for purpose that I've seen before include "End" , "Function" , "Motivation or intention" , "Resolve; reason" , "Aim, intention, design" .)
'function' is the definition.
(I know that function can be written as operate)
This is all the clue.
(Other definitions for operate that I've seen before include "Make function" , "Act in a theatre" , "Perform as surgeon does" , "Carry on business" , "Carry out surgery" .)
'function' is the definition.
(I know that function can be written as work)
This is the entire clue.
(Other definitions for work that I've seen before include "Operate" , "Monotonous song" , ". . . get on with serious business" , "Toil" , "Tasks to be undertaken" .)
'function' is the definition.
(function can mean a social event)
This is the entire clue.
(Other definitions for party that I've seen before include "Social occasion - political group" , "Political organisation" , "festive" , "MP's faction" , "Shooting weapon" .)