Film crew member editing The Grope Maniac (R) (15)

I believe the answer is:

cinematographer

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'film crew member' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'editing the grope maniac r' is the wordplay.
'editing' is an anagram indicator.
'the'+'grope'+'maniac'='thegropemaniac'
'thegropemaniac' anagrammed gives 'cinematographe'.
'cinematographe'+'r'='CINEMATOGRAPHER'

Can you help me to learn more?

(Other definitions for cinematographer that I've seen before include "Film-maker" , "Film maker" , "Pictures he makes" , "Possibly a "pic-generator"" .)

I've seen this clue in the Sydney Morning Herald.

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