Former actor Peter is upset by former actor Flynn (5)

I believe the answer is:

errol

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'flynn' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

(Other definitions for errol that I've seen before include "- Flynn, US film actor" , "- - Flynn, film star" , "- Flynn, twentieth century film actor" , "Old film star" , "-- Flynn, Hollywood actor" .)

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

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