Amber, eg (5)
I believe the answer is:
resin
'amber eg' is the definition.
(I know that amber is a type of natural resin)
This is all the clue.
(Other definitions for resin that I've seen before include "Tree gum" , "component of varnish" , "Synthetic compound" , "Elemi, for example" , "Unprocessed pine secretion" .)