Not new (3)
'not new' is the definition.
('old' is the opposite to 'new')
This is the entire clue.
(Other definitions for old that I've seen before include "Vintage" , "At an early stage - at a late stage" , "Long-established" , "Venerable" , "SECOND PART OF 14" .)
'not new' is the definition.
(used or pre-owned as opposed to new)
This is all the clue.
(Other definitions for used that I've seen before include "exhausted" , "given employment" , "took a chance on becoming dependent" , "Sued, having been employed" , "Exploited group" .)
'not new' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for second-hand that I've seen before include "Previously owned - part of watch" , "Not new - part of watch!" , "Used" , "Not original" .)
(Other definitions for secondhand that I've seen before include "Used" , "feature on a watch" .)