### Clue: Wee-wee, then sound of explosion dropping rear for baby's amusement (8)
### Answer: PEEKABOO 
 ### Explanation: Definition: baby's amusement
 PEE(to urinate;wee-wee in baby language) **plus**(then) "kaboom"(imitative of the sound of an explosion) **minus** its last letter(dropping rear).