Land tortoise quietly pushed off (7)

I believe the answer is:

terrain

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'land' is the definition.
(terrain is land or territory)

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

(Other definitions for terrain that I've seen before include "Stretch of land with respect to its character" , "Stretch of land of a particular sort" , "Physical features of a tract of land" , "Stretch of land, emphasising natural features" , "Land of a particular type" .)

I've seen this clue in The Telegraph.

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