Separated, ran out of electricity (6)
I believe the answer is:
spaced
'separated' is the definition.
('spaced' can be a synonym of 'separated')
'ran out of electricity' is the wordplay.
'ran' becomes 'sped' (I can't explain this - if you can you should give a lot more credence to this answer).
'out of' indicates putting letters inside.
'electricity' becomes 'ac' (AC is an example).
'sped' enclosing 'ac' is 'SPACED'.
Can you help me to learn more?
(Other definitions for spaced that I've seen before include "positioned at intervals" , "Separated by gaps" , "set some distance apart" , "Placed at intervals" , "strung out" .)