Elephant rider's seat (6)
I believe the answer is:
howdah
'elephant rider's seat' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for howdah that I've seen before include "Who had a change on the elephant's back" , "something to accommodate Jumbo passenger?" , "top seat?" , "seating?" , "Elephant's back pavilion" .)