### Clue: Storm over (just) pre-Christian bone formation (7)
### Answer: RIBCAGE 
 ### Explanation: Definition: bone formation
 RAGE(furious intensity;a storm) **containing**(over) IBC(or, in Roman numerals, 1BC, the year just before the Christian era, indicated by BC;before Christ, in contrast to the years in the Christian era indicated by AD;Anno Domini).