Crossword Genius

What rowdy republican might do with reservation (7)

Ross

I believe the answer is:

booking

'reservation' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

(Other definitions for booking that I've seen before include "Punishment for offending player" , "Appointment" , "Reservation" .)

I've seen this clue in The Guardian.
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