The stock market is the place to buy them (6)
I believe the answer is:
cattle
'the stock' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cattle that I've seen before include "Oxen, cows, bulls etc" , "Lowers" , "Where it naturally lies (Latin)" , "Animals bred for milk or meat" , "New York district" .)