Assassination victim of a master traitor? (5)

I believe the answer is:

marat

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'assassination victim' is the definition.
The definition suggests a singular noun which matches the answer.

'of a master traitor?' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'master' becomes 'm'.
'traitor?' becomes 'rat' (rat can mean a traitor).
'a'+'m'='am'
'am' is an anagram of 'ma'.
'ma'+'rat'='MARAT'

Can you help me to learn more?

(Other definitions for marat that I've seen before include "French revolutionary killed by Charlotte Corday" , "French revolutionary killed in his bath" , "Charlotte Corday victim" , "Charlotte Corday murdered him in his bath" , "Jean Paul -, assassinated French revolutionary" .)

I've seen this clue in the Evening Standard.

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