### Clue: Being successful, UN had pop tune composed (2,3,2-3-2)
### Answer: ON THE UP-AND-UP 
 ### Explanation: Definition: successfu
An anagram ('composed') of 'UN had pop tune'. The phrase has two meanings: successful or honest. It is probably your choice whether 'being' is part of the definition (the slightly awkward "he is being successful") or just introduces the definition.