### Clue: Goes with baked clay slab for revolutionary entrance feature (9)
### Answer: TURNSTILE 
 ### Explanation: Definition: revolutionary entrance feature
 TURNS(goes;the times for action which come in due rotation to each participant in, say, a game) + TILE(a baked clay slab, for, well, tiling a floor, a wall, or a roof).
The old revolutionary ones; and the revolutionary non-revolutionary ones: