Body organs that release secretions (6)
I believe the answer is:
glands
'body organs that release secretions' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for glands that I've seen before include "Organs that separates substances in the blood" , "Secreting organs" , "Groups of body cells that secrete substances" , "Lymph and adrenal, say" , "Various body organs that secrete substances" .)