Hide discharge (7)
I believe the answer is:
secrete
This clue is a double definition.
'hide' is the first definition.
(thesaurus)
'discharge' is the second definition.
(thesaurus)
(Other definitions for secrete that I've seen before include "Hide - discharge" , "Form substance for use within body, as liver does bile" , "Hide; as gland does" , "harbour" , "Hold and send out substance into the body as gland does" .)