Crossword Genius

Part of a castle (4)

Ross

I believe the answer is:

keep

'part of a castle' is the definition.
('keep' is part of 'castle')

This is the entire clue.

(Other definitions for keep that I've seen before include "Retain or care for" , "Main tower of a medieval castle" , "Subsistence" , "Retain in old castle tower?" , "Conserve" .)

I've seen this clue in The Independent and The Wall Street Journal.
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