Changed gear time after time getting to destination (6)
I believe the answer is:
Here is my best explanation:
'destination' is the definition.
'changed gear time after time' is the subsidiary indication.
'changed' indicates anagramming the letters.
'time' becomes 't' (**).
'after' means one lot of letters go next to another.
'time' becomes 't'.
'gear' with letters rearranged gives 'arge'.
'arget' put after 't' is 'target'.
'getting to' is the link.
(Other definitions for target that I've seen before include "Point to aim at (6).", "Goal to be aimed for", "The object with the bullseye", "Bull's-eye", "Goal, objective", "Fixed goal", "Goal; victim", "Aim point", "One aimed at" and "What's aimed at".)