Ruler suppressed in Communist’s ardour (4)

I believe the answer is:

tsar

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

'in communist's ardour' is the wordplay.
'in' indicates a hidden word.
'TSAR' can be found hidden inside 'communists ardour'.

'suppressed' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for tsar that I've seen before include "Monarch of old Russia" , "Title given to the kings of Bulgaria" , "One associated with 26 [KREMLIN]" , "Eg, Ivan the Terrible" , "Old Russian 22" .)

I've seen this clue in The Times.

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