Crossword Genius

Fifty turn up for record (3)

Ross

I believe the answer is:

log

'for record' is the definition.
(logging is a kind of recording)

'fifty turn up' is the wordplay.
'fifty' becomes 'L' (Roman numeral).
'turn' becomes 'go' (a person's move in a board game).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'go' reversed gives 'og'.
'l'+'og'='LOG'

(Other definitions for log that I've seen before include "fuel consumed" , "Written account of a voyage" , "Record book; tree part" , "Lump of wood or ship's diary" , "Official record of events" .)

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