Crossword Genius

Rook flies south from farm on old moor (6)

Ross

I believe the answer is:

anchor

'moor' is the definition.
(I've seen this before)

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

(Other definitions for anchor that I've seen before include "ground" , "Be moored" , "Horse-breeding farm" , "Last runner in relay race team" , "Brake for a boat" .)

I've seen this clue in The Independent.
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