Crossword Genius

Allegiances of kings and queens changing sides (9)

Ross

I believe the answer is:

loyalties

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

I cannot understand how the remainder of the clue works.

(Other definitions for loyalties that I've seen before include "Patriotic sentiments" , "Ties alloy into allegiances" .)

I've seen this clue in The Independent.
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