Love region for bracing air (5)
I believe the answer is:
ozone
'bracing air' is the definition.
(I've seen this before)
'love region' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'region' becomes 'zone' (zone is a kind of region).
'o'+'zone'='OZONE'
'for' acts as a link.
(Other definitions for ozone that I've seen before include "Sea air (found in layer?)" , "Layer that protects against ultraviolet rays" , "something refreshing" , "Gas formed from oxygen" , "Bracing seaside air" .)