Crossword Genius

Owl, might one say: once an opponent of the king? (15)

Ross

I believe the answer is:

parliamentarian

I believe this is a double definition.

'owl might one say' is the first definition.
(parliament can mean a group of owls)

'once an opponent of the king?' is the second definition.
(opponent of Charles I in the English Civil War)

(Other definitions for parliamentarian that I've seen before include "politician" , "Eg, an MP" , "elected representative?" , "legislator" .)

I've seen this clue in The Times.
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