Ship's journal (3)
I believe the answer is:
log
'ship's journal' 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 "Nautical record in timber?" , "Piece of wood - record" , "A ship or plane's diary" , "Official record; cut part of tree trunk" , "Bulky piece of wood" .)