### Clue: Japanese art covered by broken doorway (5)
### Answer: KENDO 
 ### Explanation: Definition: Japanese art
  **Hidden in**(covered by) broKEN DOorway.
Answer: Modern Japanese martial art of fencing with bamboo staves, or sometimes, real swords.  Literal translation is "way of the sword".
Replace the bamboo staves with light sabres and what do you have?