Crossword Genius

Last guard for castle building (4)

Ross

I believe the answer is:

keep

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

I believe this is a triple definition!

'last' is the first definition.
(thesaurus)

'guard' is the second definition.
(keeping guard is a kind of guarding)

'for' acts as a link.

'castle building' is the third definition.
'keep' can be an answer for 'castle' (keep is a type of castle). I am not certain of the 'building' bit.

Can you help me to learn more?

(Other definitions for keep that I've seen before include "Castle tower; cost of maintenance" , "Board and lodgings, perhaps" , "Subsistence" , "Retain in old castle (4)" , "Continue" .)

I've seen this clue in The Sunday Times and The Times.
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