Experience essential to keeping resort modern (7)

I believe the answer is:

episode

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'experience' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

(Other definitions for episode that I've seen before include "Instalment; incident" , "A chapter or incident" , "One instalment of a series" , "from longer work" , "Programme of a serial" .)

I've seen this clue in The Guardian.

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