It's used for ticker? (6-4)
I believe the answer is:
second-hand
'it's used' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for second-hand that I've seen before include "Not original" , "Not new - part of watch!" , "Previously owned - part of watch" , "Used" .)