Enduring pop and heavy metal involving 7 tenor (7)
I believe the answer is:
patient
'enduring' is the definition.
('patient' can be similar in meaning to 'enduring')
'pop and heavy metal involving 7 tenor' is the wordplay.
I cannot really understand how this works, but
'pop' could be 'pa' (both can mean father) and 'pa' is found in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'metal' could be 'ti' (Ti is an example) and 'ti' is present in the answer.
'tenor' could be 't' and 't' is found within the answer.
A single letter 'e' remains which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for patient that I've seen before include "One receives medical care" , "one of interest to medics?" , "Unhurried" , "One in hospital" , "Long-suffering - one under treatment" .)