Film-maker, a man working with trio (8)

I believe the answer is:

animator

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'film-maker' is the definition.
I can't tell whether this definition defines the answer.

'a man working with trio' is the wordplay.
'working with' is an anagram indicator (working with the letters).
'man' mixed up with 'trio' makes 'nimator'.
'a'+'nimator'='ANIMATOR'

Can you help me to learn more?

(Other definitions for animator that I've seen before include "Film maker" , "Cartoon maker" , "Cartoonist in films" , "Person making cartoons" , "Park, perhaps" .)

I've seen this clue in The Independent.

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