Revolutionary steals seat (5)
I believe the answer is:
stool
'seat' is the definition.
(stool is a kind of seat)
'revolutionary steals' is the wordplay.
'revolutionary' says the letters should be written in reverse.
'steals' becomes 'loots' (looting is a kind of stealing).
'loots' back-to-front is 'STOOL'.
(Other definitions for stool that I've seen before include "Small seat" , "Backless chair" , "Simple seat" , "Three-legged backless seat" , "Motion" .)