Significant coverage for Mr Twain? (4)
I believe the answer is:
sign
'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" .)