A Persian son advances in hunting expedition (6)

I believe the answer is:

safari

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'hunting expedition' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for safari that I've seen before include "African wildlife trip" , "Animal expedition" , "tropical trip" , "Long expedition" , "Expedition to observe animals" .)

I've seen this clue in The Independent.

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