Elephant (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
jumbo
'elephant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for jumbo that I've seen before include "Enormous" , "monster" , "Huge and bulky" , "Elephant - large aircraft" , "Owner of trunk" .)