Treasure finally found under different palm tree (5)
I believe the answer is:
maple
'tree' is the definition.
(maple is a kind of tree)
'treasure finally found under different palm' is the wordplay.
'finally' suggests the final letters.
'found under' says to put letters next to each other.
'different' indicates anagramming the letters.
The last letter of 'treasure' is 'e'.
'palm' is an anagram of 'mapl'.
'e' after 'mapl' is 'MAPLE'.
(Other definitions for maple that I've seen before include "plant" , "a lot of these in Canada" , "Source of syrup" , "----- leaf: symbol of Canada" , "Canadian flag leaf" .)