Organ stained and set aside (9)
I believe the answer is:
earmarked
'set aside' is the definition.
(I've seen this before)
'organ stained' is the wordplay.
'organ' becomes 'ear' (ear is a kind of organ).
'stained' becomes 'marked'.
'ear'+'marked'='EARMARKED'
'and' acts as a link.
(Other definitions for earmarked that I've seen before include "Carefully chosen" , "appearance of one who underwent piercing?" , "Like some identified animals" , "Distinguished" , "Designated for a particular purpose" .)