### Clue: During bombardment sort out required for risk-tolerant practice in 1 across (5,7)
### Answer: SHORT SELLING 
 ### Explanation: Definition: risk-tolerant practice in 1 across
  SHELLING(bombardment) **containing**(during) **anagram of**(out) SORT
Defn:  The practice of selling shares, commodities, currencies, and other financial instruments that you don't have/own at that moment.  More risk-taking than risk-tolerant I (an almost illiterate in financial matters) would have thought.