### Clue: Protective screen placed in position around most of royal family (7)
### Answer: TESTUDO 
 ### Explanation: Definition: Protective screen
 **Reversal of**(… around) SET(placed in position) + **the 1st four letters of**(most of) "Tudor"(English royal family from 1485 to 1603).
Defn: … used by the ancient Roman army.