Religious pamphlet (5)
I believe the answer is:
'religious pamphlet' is the definition.
(tract is a type of pamphlet)
This is the entire clue.
(Other definitions for tract that I've seen before include "Extensive area of land" , "Pamphlet; area of land" , "Short treatise; land area" , "Large area; pamphlet" , "religious work, often" .)