Sale organised amid unadulterated delight (8)
I believe the answer is:
pleasure
'delight' is the definition.
(I know that delight can be written as pleasure)
'sale organised amid unadulterated' is the wordplay.
'organised' is an anagram indicator.
'amid' means one lot of letters goes inside another.
'unadulterated' becomes 'pure' (similar in meaning).
'sale' anagrammed gives 'leas'.
'leas' going within 'pure' is 'PLEASURE'.
(Other definitions for pleasure that I've seen before include "Gratification of the senses" , "A desirable emotion" , "entertainment" , "contentment" , "Delight, happiness" .)