A pool that's still outside Los Angeles, in the country (6)
I believe the answer is:
poland
'a pool that's still outside' is the definition.
I can't judge whether this defines the answer.
'los angeles in the country' is the wordplay.
'los angeles' becomes 'la'.
'in' is an insertion indicator.
'the country' becomes 'pond' (I have seen 'Himalayan country ' mean 'pond' so perhaps 'country' could also mean 'pond').
'la' put within 'pond' is 'POLAND'.
Can you help me to learn more?
(Other definitions for poland that I've seen before include "EU member" , "Wroclaw's country" , "European nation" , "Slovakia's northern neighbour" , "Chopin's homeland" .)