Crossword Genius

Preserve part of a castle (4)

Ross

I believe the answer is:

keep

I believe this clue is a triple definition!

'preserve' is the first definition.
(synonyms)

'part' is the second definition.
(I have seen 'part of castle' mean 'keep' so perhaps 'part' could also mean 'keep')

'of' is a link.

'a castle' is the third definition.
(keep is a type of castle)

(Other definitions for keep that I've seen before include "Act as custodian of" , "Board and lodging" , "Retain; strong tower" , "Continue" , "Guard" .)

I've seen this clue in the Evening Standard.
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