Scarcity (4)
'scarcity' is the definition.
(dearth is a kind of scarcity)
This is the entire clue.
(Other definitions for dearth that I've seen before include "Lack of resources" , "Shortage, paucity" , "In short supply" , "Hatred (anag) -- shortage" , "Severe lack" .)
'scarcity' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lack that I've seen before include "Deficiency (of something)" , "Be wanting or without" , "Dearth" , "Deficiency or want" , "Absence, deficiency" .)