Crossword Genius

Disturbed twin - no idea throughout the country (10)

Ross

I believe the answer is:

nationwide

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

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

'disturbed twin no idea' is the wordplay.
'disturbed' is an anagram indicator (the order of letters is disturbed).
'twin'+'no'+'idea'='twinnoidea'
'twinnoidea' is an anagram of 'NATIONWIDE'.

Can you help me to learn more?

(Other definitions for nationwide that I've seen before include "for all of us" , "Across the whole country" .)

I've seen this clue in the Sydney Morning Herald.
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