Some black resin (3)
I believe the answer is:
lac
'resin' is the definition.
(resin secreted by lac insects)
'some black' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'LAC' can be found hidden inside 'black'.
(Other definitions for lac that I've seen before include "Resinous insect secretion" , "One hundred thousand" , "insects secrete this" , "Resinous substance an insect secretes" , "100,000 in rupees" .)