Culmination recalled for one enthralled by a US writer (6)
I believe the answer is:
apogee
'culmination' is the definition.
(synonyms)
'recalled for one enthralled by a us writer' is the wordplay.
'recalled for' becomes 'ge' (I can't justify this - if you can you should believe this answer much more).
'one enthralled by' indicates putting letters inside ('enthral' can mean 'capture').
'us writer' becomes 'poe' (Edgar Allan Poe).
'a'+'poe'='apoe'
'ge' placed into 'apoe' is 'APOGEE'.
(Other definitions for apogee that I've seen before include "highest height" , "Point in planet's orbit when furthest from earth" , "Culminating point or pinnacle" , "Pinnacle, highest point" , "highly significant point" .)