In S.W. Europe, one has to live on fresh air! (6)
I believe the answer is:
iberia
'in s w europe' is the definition.
I can't tell whether this definition defines the answer.
'one has to live on fresh air' is the wordplay.
'one' becomes 'i' (Roman numeral).
'has' says to put letters next to each other.
'to live' becomes 'be' (synonyms).
'on' means one lot of letters goes inside another.
'fresh' indicates an anagram (a fresh re-ordering of the letters).
'air' with letters rearranged gives 'ria'.
'be' put into 'ria' is 'beria'.
'i'+'beria'='IBERIA'
Can you help me to learn more?
(Other definitions for iberia that I've seen before include "Spain's national flag-carrying airline" , "Where Juan possibly lives" , "Spain and Portugal - airline" , "Great European peninsula containing Spain and Portugal" , "Overpower, overwhelm" .)