Copper section in Dell rival's charger (7)
I believe the answer is:
accuser
'charger' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'copper section in dell rival's' is the wordplay.
'copper' becomes 'Cu' (chemical symbol).
'section' becomes 's' (legal abbreviation).
'in' means one lot of letters goes inside another.
'dell rival' becomes 'acer' (I've seen this in another clue).
'cu'+'s'='cus'
'cus' inserted within 'acer' is 'ACCUSER'.
Can you help me to learn more?
(Other definitions for accuser that I've seen before include "one levelling the charges" , "One making allegation" , "Search, rub, thoroughly" , "One bringing a charge" , "one to prosecute" .)