I deem French game has been transformed (6,2,3)

I believe the answer is:

chemin de fer

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'been transformed' is the definition.
I can't judge whether this definition defines the answer.

'i deem french game' is the wordplay.
'game' indicates anagramming the letters (the letters play around).
'i'+'deem'+'french'='ideemfrench'
'ideemfrench' anagrammed gives 'CHEMIN-DE-FER'.

'has' acts as a link.

Can you help me to learn more?

(Other definitions for chemin de fer that I've seen before include "proceeding along French lines" , "Card game, gambling against the banker" , "French railway" , "Form of baccarat" , "Game like baccarat" .)

I've seen this clue in The Irish Independent.

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