Crossword Genius

Perhaps Tommy, troubled half-hearted rapper and cook (4,5)

Ross

I believe the answer is:

rock opera

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

'perhaps tommy' is the definition.
(work by The Who)

'troubled half-hearted rapper and cook' is the wordplay.
I cannot really understand how this works, but
an anagram of 'cook' is 'ocko' which is present in the answer.
This may be the basis of the clue (or it may be nonsense).

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 Telegraph.
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