Part of NYSE (5)
I believe the answer is:
stock
'part of nyse' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stock that I've seen before include "Liquid used as base for soup or sauce" , "Total of goods kept by trader" , "Wares" , "Consomm-like liquid" , "Keep" .)