Crossword Genius

Polo ground record? (3)

Ross

I believe the answer is:

log

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

'record?' is the definition.
(log is a kind of record)

'polo ground' is the wordplay.
'LOG' is hidden within the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for log that I've seen before include "Bulky piece of wood" , "Record book; tree part" , "number in maths class?" , "Sea captain's diary of voyage" , "Record kept" .)

I've seen this clue in the Evening Standard.
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