### Clue: Ready to turn round when attack begins (4,5)
### Answer: SETS ABOUT 
 ### Explanation: Definition: begins
 SET(ready to act, as in "all set to take off") + **reversal of**(to turn round) AS(when, as in "as you enter the room") + BOUT(an attack of illness or emotion as in "a bout of depression").
Defn: …;starts doing something with vigour or determination, as in "the dog sets about chewing on his bone".