Find a colt rampaging with energy (6)
I believe the answer is:
locate
'find' is the definition.
(I know that locate is a more specific form of the action find)
'a colt rampaging with energy' is the wordplay.
'rampaging with' is an anagram indicator.
'energy' becomes 'e' (physics symbol as in E=mc2).
'a'+'colt'='acolt'
'acolt' mixed up with 'e' makes 'LOCATE'.
(Other definitions for locate that I've seen before include "Put in place" , "Pinpoint, find" , "Pinpoint in Alecto" , "Find or situate" , "Discover the exact position of" .)