Choose trick, essentially, that's going to be thrilling (8)
I believe the answer is:
electric
'to be thrilling' is the definition.
(I've seen this in another clue)
'choose trick essentially' is the wordplay.
'choose' becomes 'elect' (electing is a kind of choosing).
'essentially' means to look at the middle letters.
The centre of 'trick' is 'ric'.
'elect'+'ric'='ELECTRIC'
'that's going' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for electric that I've seen before include "Thrillingly exciting" , "stirring" , "type of chair nobody wants to end up in?" , "Tense" , "This storm has lots of thunder and lightning" .)