### Clue: Commando short of experience joining engineers in punt (5,5)
### Answer: GREEN BERET 
 ### Explanation: Definition: Commando
 GREEN(short of experience/untrained) **plus**(joining) [RE(abbrev. for the Royal Engineers in the British military) **contained in**(in) BET(to punt/to wager) ].
Defn: … in eg. the British military.