Resin from tree around eastern India (5)
I believe the answer is:
elemi
'resin' is the definition.
(elemi is a kind of resin)
'tree around eastern india' is the wordplay.
'tree' becomes 'elm' (elm tree is a kind of tree**).
'around' is an insertion indicator.
'eastern' becomes 'e'.
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'elm' enclosing 'e' is 'elem'.
'elem'+'i'='ELEMI'
'from' is the link.
(Other definitions for elemi that I've seen before include "Tree resin; ie, elm (anag.)" , "Resinous stuff" , "Fragrant substance" , "Fragrant tree resin used as incense - I'm Lee (anag)" , "Oleoresin" .)