A sect Jim created in impressive fashion (8)
I believe the answer is:
majestic
'a sect jim created in impressive fashion' is the definition.
I can't judge whether this defines the answer.
'a sect jim created in' is the wordplay.
'created' indicates an anagram (I've seen 'creating' mean this).
'in' means one lot of letters goes inside another.
'sect'+'jim'='sectjim'
'sectjim' with letters rearranged gives 'mjestic'.
'a' inserted into 'mjestic' is 'MAJESTIC'.
Can you help me to learn more?
(Other definitions for majestic that I've seen before include "Regal - grand" , "Regal, imperial" , "'Regal, royal (8)'" , "Regal - stately" , "Of royal appearance or status" .)