Solitary revolutionary supporter of Charles I (8)

I believe the answer is:

royalist

'supporter of charles i' is the definition.
(in the English Civil War)

'solitary revolutionary' is the wordplay.
'revolutionary' is an anagram indicator.
'solitary' anagrammed gives 'ROYALIST'.

(Other definitions for royalist that I've seen before include "Monarchist" , "Supporter of monarchy" , "12 (anag)" , "Advocate of the principles of monarchy" , "Monarch's supporter" .)

I've seen this clue in The Times.

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