### Clue: Boy employed by Joe on oil rig oddly blossoms (8)
### Answer: GLADIOLI 
 ### Explanation: Definition: blossoms
 LAD(a boy) **contained in**(employed by) GI(Joe;a US soldier) **plus**(on, in a down clue) **the 1st, 3rd, and 5th letters of**(… oddly) "oil rig".