Rock hurtled into French cottage (7)
I believe the answer is:
granite
'rock' is the definition.
(type of rock)
'hurtled into french cottage' is the wordplay.
'hurtled' becomes 'ran' ('hurtle' can mean to move at high speed).
'into' is an insertion indicator.
'french cottage' becomes 'gite' (I can't justify this - if you can you should give a lot more credence to this answer).
'ran' inserted within 'gite' is 'GRANITE'.
Can you help me to learn more?
(Other definitions for granite that I've seen before include "Tangier (anag.)" , "Showing great resolution" , "Igneous rock, generally composed of feldspar and mica and quartz" , "determination" , "Coarse-grained igneous rock" .)