Make extended remix of metal song principally lacking energy (8)
I believe the answer is:
elongate
'make' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?
'extended remix of metal song principally lacking energy' is the wordplay.
I cannot quite see how this works, but
'extended' could be 'long' (extended can mean longer than usual) and 'long' is present in the answer.
'metal' could be 'e' (E is an example) and 'e' is found within the answer.
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is present in the answer.
The remaining letters 'at' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for elongate that I've seen before include "Stretch, lengthen" , "Stretch, pull" , "Spread" , "Widen" , "Draw out" .)