Outcast going back into fresh air apparently (6)
I believe the answer is:
pariah
'outcast' is the definition.
('pariah' can be a synonym of 'outcast')
'going back into fresh air apparently' is the wordplay.
'going back' says the letters should be written in reverse.
'into' indicates a hidden word.
'hairap' can be found hidden inside 'fresh air apparently'.
'hairap' in reverse letter order is 'PARIAH'.
(Other definitions for pariah that I've seen before include "Person despised and rejected by society" , "Person despised and avoided" , "Person ostracised by society" , "person shunned" , "Outcast (dog)" .)