You and I organise sale for animal (6)
I believe the answer is:
weasel
'for animal' is the definition.
(I've seen this before)
'you and i organise sale' is the wordplay.
'you and i' becomes 'we'.
'organise' is an anagram indicator.
'sale' is an anagram of 'asel'.
'we'+'asel'='WEASEL'
(Other definitions for weasel that I've seen before include "Sneaky person - small, long-necked carnivorous animal" , "Boggle" , "Rat" , "Small mammal with short legs and long body and neck" , "Carnivore -- saw eel (anag)" .)