Golf ball indentation (6)
I believe the answer is:
dimple
'golf ball indentation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dimple that I've seen before include "Small natural hollow in a cheek" , "Attractive facial indentation" , "Small depression in flesh" , "Chin indentation" , "Attractive indentation in face" .)