Available on the stock exchange (6)
I believe the answer is:
traded
'available on the stock exchange' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for traded that I've seen before include "Did business, bought and sold" , "Darted (anag.)" , "Dealt" , "Engaged in commerce" , "Exchanged, bartered" .)