### Clue: Elgin having lost marbles, horse half gone, revealing habit (8)
### Answer: NEGLIGEE 
 ### Explanation: Definition: revealing habit
  **Anagram of**(having lost marbles) ELGIN + GEE{"gee-gee",horse **minus**(gone) half of the word}
Defn: Revealing nightwear,habit – I had "low-necked"="revealing" in the puzzle I blogged 2 days ago.  Nice surface with Elgin and his marbles (the sculptured sort).