One replaced at the polo ground? (5)
I believe the answer is:
divot
'ground?' is the definition.
(divot is a kind of ground)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for divot that I've seen before include "Golfer's dislodged turf" , "Turf lifted by golf club" , "Gouged-out turf" , "Small piece of turf cut out" , "Bit of turf cut out by golf club" .)