Old princess has upset a servant (8)

I believe the answer is:

tsarevna

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'old princess' is the definition.
The definition suggests a singular noun which matches the answer.

'upset a servant' is the wordplay.
'upset' indicates anagramming the letters.
'a'+'servant'='aservant'
'aservant' with letters rearranged gives 'TSAREVNA'.

'has' is the link.

Can you help me to learn more?

(Other definitions for tsarevna that I've seen before include "Daughter of old Russian ruler" , "relative of the emperor" , "Daughter of a Russian tsar" .)

I've seen this clue in The Times.

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