Gland near the kidneys (7)
I believe the answer is:
adrenal
'gland near the kidneys' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for adrenal that I've seen before include "Gland that secretes the fight or flight hormone" , "Relating to glands near the kidneys" , "(Gland) on the kidney" , "Gland near the kidneys" , "Relating to certain glands" .)