Ewe said it! (3)
I believe the answer is:
baa
'ewe said it' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for baa that I've seen before include "Sound of sheep" , "Bleat of a sheep" , "Cry of a sheep" , "to Heathrow, the operators" , "Sheep's bleat" .)