Ball that blocks the putter and ties my shot (6)
I believe the answer is:
stymie
'ball that blocks the putter' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'ties my shot' is the wordplay.
'shot' is an anagram indicator.
'ties'+'my'='tiesmy'
'tiesmy' with letters rearranged gives 'STYMIE'.
'and' is the link.
Can you help me to learn more?
(Other definitions for stymie that I've seen before include "Hinder the progress of (something)" , "Thwart, foil" , "Block or obstruct as in golf (6)" , "Prevent (by getting in the way)" , "Situation from which it is almost impossible to proceed" .)