Dog star (6)
'dog star' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lassie that I've seen before include "Scots girl - film dog" , "Girl from Scotland and dog from film" , "Hollywood film-star dog" , "Screen mutt - Scottish girl" , "Cinema dog who went home" .)
'dog star' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for sirius that I've seen before include "One very bright" , "It's known as the Dog Star" , "The Dogstar" , "Prominent star" , "The Dog Star, brightest of the fixed stars" .)