Periodical about electricity supply (9)
I believe the answer is:
recurrent
'periodical' is the definition.
(I've seen this before)
'about electricity supply' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is located in the answer.
'electricity' could be 'current' (current electricity is a kind of electricity) and 'current' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for recurrent that I've seen before include "taking place periodically" , "Happening often" , "Repeated again and again" , "Happening repeatedly" , "Occurring repeatedly" .)