Island king into heavy metal and current pop (8)
I believe the answer is:
trinidad
'island' is the definition.
(Trinidad is an example)
'metal and current pop' is the wordplay.
'metal' becomes 'trin' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'current' becomes 'I' (symbol for electric current).
'pop' becomes 'dad' (both can mean one's father).
'trin'+'i'+'dad'='TRINIDAD'
'king into heavy' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for trinidad that I've seen before include "West Indian island paired with Tobago" , "English-speaking island off Venezuela" , "Caribbean island" , "West Indies island" , "W. I. island" .)