Best alfresco function? (5)
I believe the answer is:
outdo
'best' is the definition.
(I know that best can be written as outdo)
'alfresco function?' is the wordplay.
'alfresco' becomes 'out' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'function?' becomes 'do' (both can mean an event).
'out'+'do'='OUTDO'
(Other definitions for outdo that I've seen before include "Exceed" , "Beat" , "Get the better of" , "Br superior to (someone)" , "Overtake" .)