Better function in the fresh air?
I believe the answer is:
outdo
'better function in the fresh air?' is the definition.
'outdo' can be an answer for 'better' (I've seen this before). I am not sure about the 'function in the fresh air?' bit.
'better function' is the wordplay.
'better' becomes 'out' (I can't justify this - if you can you should give a lot more credence to this answer).
'function' becomes 'do' (I've seen this in other clues).
'out'+'do'='OUTDO'
Can you help me to learn more?
(Other definitions for outdo that I've seen before include "Cap" , "Br superior to (someone)" , "Get the better of" , "Defeat" , "Eclipse" .)