Put off until later
'put off until later' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for defer that I've seen before include "Adjourn" , "Delay" , "Put off, postpone" , "Freed (anag.)" , "Stay" .)
(Other definitions for postpone that I've seen before include "'Put off, delay (8)'" , "Put off till later" , "Put off till another time" , "Put off, defer" , "Put off until future date" .)