Crossword Genius

Planned route I go around in time (9)

Ross

I believe the answer is:

itinerary

I'm a little stuck... Click here to teach me more about this clue!

'planned route' is the definition.
(I've seen this before)

'i go around in time' is the wordplay.
I cannot really understand how this works, but
'i' could be 'a' and 'a' is located in the answer.
'go' could be 'err' (erring is a kind of going) and 'err' is found within the leftover letters.
'in' is present in the answer.
'time' could be 't' and 't' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for itinerary that I've seen before include "List of places" , "schedule" , "Planned journey" , "Record of a journey" , "Tiny airer? (anagram)" .)

I've seen this clue in The Times.
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