The Sea Road to ____ is a ferry service from Wemyss Bay to the main town of Bute (8)

I believe the answer is:

rothesay

(Other definitions for rothesay that I've seen before include "Chief town on Bute; so hearty (anag.)" , "Main town on Bute" , "Scottish town" , "Town on Isle of Bute" .)

I've seen this clue in The Times.

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