Shania: I want out (5)

I believe the answer is:

twain

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'shania' is the definition.
I can't tell whether this definition defines the answer.

'i want out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'i'+'want'='iwant'
'iwant' anagrammed gives 'TWAIN'.

Can you help me to learn more?

(Other definitions for twain that I've seen before include "Pair (archaic) - US novelist, Mark" , "Kipling never expected to meet" , "Mark in American literature" , "that was a low number" , "US author Mark, attributed with the quote "golf is a good walk spoiled"" .)

I've seen this clue in The Sun.

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