Area monitored we hear (5)

I believe the answer is:

tract

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'area' is the definition.
(I know that tract is a type of area)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tract that I've seen before include "Extended area of land" , "Large area of land or small booklet" , "religious work in > area" , "Anatomical structure" , "Large area; pamphlet" .)

I've seen this clue in The Sun.

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