House Chinese military guards (4)
I believe the answer is:
Here is my best explanation:
'house' is the definition.
(I've seen this before)
'chinese military guards' is the subsidiary indication.
'guards' indicates the answer is hidden within the clue.
'semi' is hidden in the letters of 'chinese military'.
(Other definitions for semi that I've seen before include "Partly detached home", "accommodation", "Not detached house", "One house of pair", "game in cup after several wins", "Co-joined house", "The next to final round", "Property attached to another", "Type of house (UK) - type of truck (US)" and "House joined to another".)