Field scientist shifted base to southern tip (7)

I believe the answer is:

pasture

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'field' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for pasture that I've seen before include "Field suitable for grazing" , "Grass for grazing" , "Grassland" , "Stock holder, perhaps" , "Meadow" .)

I've seen this clue in The Hindu.

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