Monarch captured by parliament's army (4)

I believe the answer is:

tsar

'monarch' is the definition.
(historical term for Russian king)

'captured by parliament's army' is the wordplay.
'captured by' indicates a hidden word.
'TSAR' is hidden in the letters of 'parliaments army'.

(Other definitions for tsar that I've seen before include "Despot" , "Russian monarch" , "Absolute ruler" , "Monarch of old Russia" , "Star for a Russian emperor" .)

I've seen this clue in the Sydney Morning Herald.

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