One improving property of solution for paparazzo? (9)

I believe the answer is:

developer

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'solution for paparazzo?' is the definition.
(solution used for developing photos)

I don't understand the remainder of the clue.

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(Other definitions for developer that I've seen before include "that produces positive results" , "kind of entrepreneur" , "It creates image" , "striving to achieve a positive image?" , "One benefiting from property" .)

I've seen this clue in The Times.

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