Milliner (6)
'milliner' is the definition.
(synonyms)
This is all the clue.
(Other definitions for hatter that I've seen before include "Maker of headwear" , "Tea party participant (Alice)" , "Tea-party holder" , "Milliner" , "Tea Party member" .)
'milliner' is the definition.
(I know that milliner can be written as hatmaker)
This is the entire clue.
(Another definition for hatmaker that I've seen is " Milliner".)