Aircraft enclosure's energy supplied with sodium battery (7)
I believe the answer is:
nacelle
'aircraft enclosure's energy' is the definition.
I can't judge whether this defines the answer.
'supplied with sodium battery' is the wordplay.
'supplied' becomes 'elle' (I can't justify this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'sodium' becomes 'NA' (chemical symbol).
'battery' becomes 'C battery' (C battery is an example).
'na'+'c'='nac'
'elle' after 'nac' is 'NACELLE'.
Can you help me to learn more?
(Other definitions for nacelle that I've seen before include "Streamlined housing on an aircraft" , "part of the aeroplane" , "airship's gondola" , "Vivid; promising" , "Enclosure for an aircraft engine" .)