Polo ground record? (3)
I believe the answer is:
log
'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" .)