Dodge duel, wasting energy (5)
I believe the answer is:
elude
'dodge' is the definition.
(I know that dodge is a more specific form of dodge)
'duel wasting energy' is the wordplay.
'wasting' indicates an anagram (waste can mean to destroy).
'energy' becomes 'e' (physics symbol as in E=mc2).
'duel' anagrammed gives 'elud'.
'elud'+'e'='ELUDE'
(Other definitions for elude that I've seen before include "Avoid first" , "Dodge, duck" , "Escape - avoid" , "Evade, escape from" , "Get round" .)