Writer seen in superior wellies (6)
I believe the answer is:
orwell
'writer' is the definition.
(writer George Orwell)
'in superior wellies' is the wordplay.
'in' indicates a hidden word.
'ORWELL' is hidden within 'superior wellies'.
'seen' acts as a link.
(Other definitions for orwell that I've seen before include "River" , "George -, nineteen eighty four author" , "Socialist author" , "Author of 1984 etc" , "George ...... wrote 'Animal Farm' and '1984'" .)