Fulcrum (5)
'fulcrum' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pivot that I've seen before include "Turning pin" , "Point about which something turns" , "Fulcrum" , "Central point on which things turn" , "Revolve" .)
(Other definitions for lever that I've seen before include "Purchase from bar" , "Prize" , "Crowbar" , "Machine operator" , "Means of exerting force" .)