Crossword Genius

A Mass in Castle (4)

Ross

I believe the answer is:

keep

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

'castle' is the definition.
(thesaurus)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for keep that I've seen before include "Retain; part of castle" , "honour" , "run" , "Fort" , "Act as custodian of" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.