Musical recap, OK or terrible? (4,5)

I believe the answer is:

rock opera

I'm a little stuck... Click here to teach me more about this clue!

'musical' is the definition.
I know nothing about this answer so I can't tell whether this works.

'recap ok or terrible?' is the wordplay.
'terrible?' is an anagram indicator (I've seen 'terrible' mean this).
'recap'+'ok'+'or'='recapokor'
'recapokor' with letters rearranged gives 'ROCK OPERA'.

Can you help me to learn more?

(Other definitions for rock opera that I've seen before include "Tommy, for example" , "Show" .)

I've seen this clue in The Times.

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