Corgi, say (3)
I believe the answer is:
dog
'corgi say' is the definition.
(corgi is a kind of dog)
This is all the clue.
(Other definitions for dog that I've seen before include "'Every . . . has its day'" , "St Bernard, for example" , "Domestic animal" , "Sort of collar, fight, days" , "A pet; its life prov. wretched" .)