Crossword Genius

Significant coverage for Mr Twain? (4)

Ross

I believe the answer is:

sign

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'significant' is the definition.
(thesaurus)

'coverage for mr twain?' is the wordplay.
I cannot quite understand how this works, but
'mr' could be 'sig' and 'sig' is found within the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for sign that I've seen before include "Mark" , "Leo, for instance" , "Public notice; portent" , "Show" , "Indication - put one's name down" .)

I've seen this clue in The Irish Times.
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