Men's swimsuits on elephants? (6)
I believe the answer is:
trunks
'men's swimsuits on elephants?' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trunks that I've seen before include "Swimming shorts" , "Men's swimsuit" , "Swimwear" , "Parts of trees and elephants" , "luggage" .)