With this, king moves to castle (4)

I believe the answer is:

rook

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This could be a double definition.

'with this king moves' is the first definition.
'rook' can be an answer for 'king' (thesaurus). I'm unsure of the rest of the definition.

'castle' is the second definition.
(synonyms)

'to' is the link.

Can you help me to learn more?

(Other definitions for rook that I've seen before include "Rip off - bird" , "embattled man" , "Swindle (colloq.); bird" , "Poignant, evocative" , "Swindle; castle" .)

I've seen this clue in The Times.

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