Current needed in burnt out energy generator (7)
I believe the answer is:
turbine
'generator' is the definition.
(thesaurus)
'current needed in burnt out energy' is the wordplay.
'current' becomes 'i' (symbol for electric current).
'needed in' means one lot of letters goes inside another.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'energy' becomes 'e' (physics symbol as in E=mc2).
'burnt' is an anagram of 'turbn'.
'i' placed into 'turbn' is 'turbin'.
'turbin'+'e'='TURBINE'
(Other definitions for turbine that I've seen before include "Engine driven by spinning blades" , "Machine driven by tribune" , "Rotary motor" , "Machine producing power when water drives a rotor, for example" , "Machine or motor for tribune" .)