A country I am entering succeeded in films (10)

I believe the answer is:

animations

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

'a country i am entering succeeded' is the wordplay.
'country' becomes 'nation' (synonyms).
'i am' becomes 'I'm' (contraction).
'entering' means one lot of letters goes inside another.
'succeeded' becomes 's' (genealogical abbreviation).
'nation' enclosing 'im' is 'nimation'.
'a'+'nimation'+'s'='ANIMATIONS'

'in' acts as a link.

Can you help me to learn more?

(Another definition for animations that I've seen is " figure in exchange?".)

I've seen this clue in The Daily Express.

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