Crossword Genius

A certain area of literature (5)

Ross

I believe the answer is:

tract

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'a certain area' is the definition.
'tract' can be an answer for 'area' (tract is a kind of area). I'm not certain of the 'a certain' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tract that I've seen before include "Pamphlet; area of land" , "Large area; pamphlet" , "Stretch of land or religious pamphlet" , "anthem" , "Extensive area of land" .)

I've seen this clue in the Evening Standard.
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