Produce, as by a gland (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
secrete
(Other definitions for secrete that I've seen before include "Hide or conceal an object" , "Hide - discharge" , "harbour" , "Hold and send out substance into the body as gland does" , "Form substance for use within body, as liver does bile" .)