Crossword Genius

Manic, running wild touring America, one who's in a band? (8)

Ross

I believe the answer is:

musician

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

'who's in a band?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'manic running wild touring america one' is the wordplay.
'running wild' indicates an anagram.
'touring' indicates putting letters inside (touring can mean going round).
'america' becomes 'US' (United States).
'one' becomes 'I' (Roman numeral).
'manic' with letters rearranged gives 'mcian'.
'us'+'i'='usi'
'mcian' enclosing 'usi' is 'MUSICIAN'.

Can you help me to learn more?

(Other definitions for musician that I've seen before include "Instrumentalist, player" , "person on the fiddle perhaps" , "Eg, singer, instrumentalist" , "Eg, orchestral player" , "Trombonist or drummer, say" .)

I've seen this clue in The Telegraph.
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