A tram in revolutionary form (5)

I believe the answer is:

marat

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'form' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'a tram in revolutionary' is the wordplay.
'in' indicates putting letters inside.
'revolutionary' shows that the letters should be reversed in order (letters revolve around).
'a' inserted into 'tram' is 'taram'.
'taram' backwards is 'MARAT'.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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