City structure held electric current (5)
I believe the answer is:
delhi
'city' is the definition.
(I know that Delhi is a city)
'structure held electric current' is the wordplay.
'structure' indicates anagramming the letters.
'electric current' becomes 'I' (physics symbol).
'held' is an anagram of 'delh'.
'delh'+'i'='DELHI'
(Other definitions for delhi that I've seen before include "Indian state" , "Old city of north central India" , "It's also new in India" , "Capital of India" , "Asian city" .)