Glandular organ (8)
(Other definitions for pancreas that I've seen before include "Gland aiding digestion" , "Part of body" , "organ" , "Gland secreting digestive enzymes" , "insulin producer" .)
'glandular organ' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for liver that I've seen before include "Bile-secreting organ" , "One extant" , "Bile-secreting gland" , "Glandular organ of the stomach" , "Large organ in the abdomen secreting bile" .)