Location of fire initially suppressed with soil (5)
I believe the answer is:
earth
'soil' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for earth that I've seen before include "Terrestrial sphere" , "World - soil" , "Lair; planet" , "Solid ground" , "cost of which is very high" .)