European city’s energy plans redrawn (6)
I believe the answer is:
naples
'european city's' is the definition.
(I've seen this before)
'energy plans redrawn' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'redrawn' indicates anagramming the letters (I've seen this in other clues).
'e'+'plans'='eplans'
'eplans' anagrammed gives 'NAPLES'.
(Other definitions for naples that I've seen before include "Italian port blockaded by Nelson" , "European city" , "endless sleep after being here?" , "Planes (anag) - somewhere in Italy" , "Planes go awry in Italian port" .)