Strategy in Ring opera, promoting right to take drugs? (4-1-4)

'strategy in ring' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'opera promoting right to take drugs?' is the wordplay.
I cannot really understand how this works, but
an anagram of 'opera' is 'ropea' which is located in the answer.
'take' could be 'do' (eg taking or doing drugs) and 'do' is present in the answer.
'drugs?' could be 'e' (abbreviation for ecstasy) and 'e' is found within the answer.
A single letter 'p' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?