Record what's left to go wrong (3)
I believe the answer is:
log
'record' is the definition.
(log is a kind of record)
'left to go wrong' is the wordplay.
'left' becomes 'l' (common abbreviation).
'to' means one lot of letters go next to another.
'wrong' indicates anagramming the letters.
'go' anagrammed gives 'og'.
'l'+'og'='LOG'
'what's' acts as a link.
(Other definitions for log that I've seen before include "Record; cut wood" , "Lump of wood or ship's diary" , "Piece of cut wood" , "Official record of events" , "Written account of a voyage" .)