Experience essential to keeping resort modern (7)
I believe the answer is:
episode
'experience' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(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" .)