One's inspired by something comforting in a psalm to find organ (7)
I believe the answer is:
thyroid
'organ' is the definition.
(thyroid is a kind of organ)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for thyroid that I've seen before include "Growth-regulating gland" , "Growth-controlling gland" , "Gland in the neck" .)