Charge the current copper's centre half (7)
I believe the answer is:
accusal
'charge' is the definition.
(I know that accusal is a type of charge)
'current copper's centre half' is the wordplay.
'current' becomes 'ac' (alternating current).
'copper's' becomes 'cu's' (Cu is the chemical symbol for copper).
'centre' says to take the centre.
The middle letters of 'half' are 'al'.
'ac'+'cus'+'al'='ACCUSAL'
'the' acts as a link.
(Other definitions for accusal that I've seen before include "Formal charge of wrongdoing" , "Indictment" , "Act of imputing blame or guilt" .)