Exciting to be driven by power (8)
I believe the answer is:
electric
This clue might be a double definition.
'exciting' is the first definition.
(similar in meaning)
'driven by power' is the second definition.
'electric' can be an answer for 'power' (electric power is a kind of power). I'm not sure about the 'driven by' bit.
'to be' acts as a link.
Can you help me to learn more?
(Other definitions for electric that I've seen before include "Relic etc charged with current" , "Of a type of energy" , "Type of light, fire, shock, etc" , "Thrilling (potentially shocking?)" , "Energetic" .)