Detective's house is free (8)
I believe the answer is:
dislodge
'is free' is the definition.
(I've seen this in another clue)
'detective's house' is the wordplay.
'detective's' becomes 'di's' (Detective Inspector abbreviation).
'house' becomes 'lodge' (lodge is a kind of house).
'dis'+'lodge'='DISLODGE'
(Other definitions for dislodge that I've seen before include "Knock from an established position" , "Force from an established position" , "Digs lode (anag.)" , "Knock out of a fixed position" , "Glided so as to move from established position" .)