Chair sent east (4)
I believe the answer is:
seat
'chair' is the definition.
(something to sit on)
'sent east' is the wordplay.
'sent' indicates anagramming the letters (send can mean to excite or stimulate).
'east' is an anagram of 'SEAT'.
(Other definitions for seat that I've seen before include "A manner of sitting on horse" , "MP's place in parliament" , "Behind" , "Position (in parliament)" , "pew?" .)