Decoration for Head of Police initially concealed by House (7)
I believe the answer is:
chaplet
'decoration' is the definition.
(chaplet is a kind of decoration)
'police initially concealed by house' is the wordplay.
'police initially' becomes 'p' (I can't justify this - if you can you should believe this answer much more).
'concealed by' is an insertion indicator.
'house' becomes 'chalet' (chalet is a kind of house).
'p' put within 'chalet' is 'CHAPLET'.
'for head of' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for chaplet that I've seen before include "flower arrangement" , "Circular garland for the head" , "Ornamental wreath worn on the head" , "Little fellow" , "top band?" .)