Best alternative under the sun (7)
I believe the answer is:
outdoor
'best alternative under the sun' is the definition.
I can't judge whether this defines the answer.
'best alternative under' is the wordplay.
'best' becomes 'outdo' (synonyms).
'alternative' becomes 'or'.
'under' is a charade indicator (letters next to each other).
'outdo'+'or'='OUTDOOR'
Can you help me to learn more?
(Other definitions for outdoor that I've seen before include "Not done in the house" , "in the garden, say" , "Alfresco - sort of pursuits" , "Used in the open air" , "Done in the open" .)