Clear out country house storing metal targets here (8,5)
I believe the answer is:
shooting range
'targets here' is the definition.
(a shooting range has targets for shooting practice)
'clear out country house storing metal' is the wordplay.
'clear out' becomes 'shoo' (to shoo is to clear out or send away).
'country house' becomes 'grange' (a grange is a rural residence).
'storing' means one lot of letters goes inside another.
'metal' becomes 'tin' (tin is a kind of metal).
'shoo'+'grange'='shoogrange'
'shoogrange' placed around 'tin' is 'SHOOTING-RANGE'.
(Other definitions for shooting range that I've seen before include "targets are set" , "target area" , "Source of reports" , "Place for firing at targets" , "where folk fire off guns" .)