Crossword Genius

Maintain feature of castle (4)

Ross

I believe the answer is:

keep

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'maintain feature' is the first definition.
'keep' can be an answer for 'maintain' ('keep' can be a synonym of 'maintain'). I am not sure about the 'feature' bit.

'castle' is the second definition.
(thesaurus)

'of' acts as a link.

Can you help me to learn more?

(Other definitions for keep that I've seen before include "Only one cricketer on field will" , "run" , "Dungeon" , "Remain" , "strong position" .)

I've seen this clue in The Mirror.
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