Situated in the garden, say, better alternative (7)
I believe the answer is:
outdoor
'situated in the garden' is the definition.
I can't tell whether this defines the answer.
'better alternative' is the wordplay.
'better' becomes 'outdo' (to outdo is to beat or do better than).
'alternative' becomes 'or'.
'outdo'+'or'='OUTDOOR'
'say' is the link.
Can you help me to learn more?
(Other definitions for outdoor that I've seen before include "This sport is not under a roof" , "not under cover" , "Al fresco" , "Alfresco - sort of pursuits" , "Not done in the house" .)