Record of a voyage (3)
I believe the answer is:
log
'record of a voyage' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for log that I've seen before include "Official record; cut part of tree trunk" , "Nautical record in timber?" , "Diary kept by ship's captain" , "number in maths class?" , "Register" .)