Mackintosh (3)
'mackintosh' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for raincoat that I've seen before include "Waterproof outer garment" , "Mackintosh" , "clothing" , "Catriona (anag.)" , "Protective garment for Croatian" .)
'mackintosh' is the definition.
(synonyms)
This is all the clue.
(Other definitions for mac that I've seen before include "Waterproof coat (colloq.)" , "Overcoat" , "A Gaelic son, often in name" , "A rainproof" , "PC" .)