Time in prison: that is what golfer wants (6)
I believe the answer is:
birdie
'time in prison that is what golfer wants' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'time in prison that is' is the wordplay.
'time in prison' becomes 'bird' (bird is slang for time spent in prison).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'bird'+'ie'='BIRDIE'
Can you help me to learn more?
(Other definitions for birdie that I've seen before include "Golf score of one stroke under par" , "low score" , "Golfing score better than par" , "Good hole" , "In golf, a score of one under par for the hole" .)