Souvenir from Rome I'm changing (6)

I believe the answer is:

memoir

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'souvenir' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'rome i'm changing' is the wordplay.
'changing' is an anagram indicator.
'rome'+'im'='romeim'
'romeim' with letters rearranged gives 'MEMOIR'.

'from' is the link.

Can you help me to learn more?

(Other definitions for memoir that I've seen before include "Personal life story" , "Personal history" , "Personal biography" , "Written record of personal experiences" , "Essay on a learned subject" .)

I've seen this clue in The Sun.

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