Crossword Genius

Secretly look up to find castle tower (4)

Ross

I believe the answer is:

keep

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for keep that I've seen before include "Hold - part of castle" , "honour" , "Look after" , "Only one cricketer on field will" , "Retain; strong tower" .)

I've seen this clue in The Times.
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