Elucidate (7)
I believe the answer is:
explain
'elucidate' is the definition.
(I know that elucidate is a more specific form of the action explain)
This is the entire clue.
(Other definitions for explain that I've seen before include "Show the meaning of, make clear" , "Shed light" , "Elucidate, make clear" , "Justify" , "Resolve" .)