Frankincense or mastic, for instance (5)
I believe the answer is:
resin
I believe this is a double definition.
'frankincense' is the first definition.
(thesaurus)
'mastic for instance' is the second definition.
(I know that mastic is a type of natural resin)
(Other definitions for resin that I've seen before include "varnish, perhaps" , "Synthetic compound" , "Rinse out this substance from trees" , "Material exuded from tree" , "frankincense, for instance?" .)