Love area’s clean, bracing air (5)
I believe the answer is:
ozone
'clean bracing air' is the definition.
(I've seen this before)
'love area's' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'area' becomes 'zone' (zone is a kind of area).
'o'+'zone'='OZONE'
(Other definitions for ozone that I've seen before include "Protection" , "bracing atmosphere" , "Seaside air, maybe" , "Stratospheric layer of gas -- invigorating sea air" , "Sea-air" .)