One gets it in time (5)
I believe the answer is:
Here is my best explanation:
'one' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'it in time' is the wordplay.
I cannot really see how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is located in the answer.
'time' could be 'old' (old is a kind of time) and 'old' is located in the answer.
A single letter 'r' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'gets' is the link.
(Other definitions for older that I've seen before include "Less young", "Former", "Advanced in years (but wiser?)", "More mature", "More aged", "Of greater age (O, not E)", "More elderly", "Increasingly mature", "more history" and "as we all will be tomorrow".)