### Clue: Unruly imp with short trousers and onesie (6,4)
### Answer: ROMPER SUIT 
 ### Explanation: Definition: onesie
 **Anagram of**(Unruly) [IMP **plus**(with) "trousers" **minus its last letter**(short …)].
Defn: A garment in one piece, and hence a "onesie".
A onesie:   and a romper: 
Synonymous?