Eg, donkey (5,2,6)

I believe the answer is:

beast of burden

(Other definitions for beast of burden that I've seen before include "Load-carrying animal ..." , "Animal used for carrying loads" , "Animal used for heavy work" , "Pack animal" , "donkey, say" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.