Better you're regularly in the fresh air (7)
I believe the answer is:
outdoor
'fresh air' is the definition.
'outdoor' can be an answer for 'air' (I have seen 'open air' mean 'outdoor' so perhaps 'air' could also mean 'outdoor'). I am not certain of the 'fresh' bit.
'better you're regularly' is the wordplay.
'better' becomes 'outdo' (to outdo is to beat or do better than).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'youre' are 'or'.
'outdo'+'or'='OUTDOOR'
'in the' acts as a link.
Can you help me to learn more?
(Other definitions for outdoor that I've seen before include "Open-air" , "This sport is not under a roof" , "Used in the open air" , "not under cover" , "External" .)