Something supportive for a sportsman (3)
I believe the answer is:
tee
'sportsman' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tee that I've seen before include "Where a hole starts" , "Start of a hole in golf" , "Starting peg" , "Stand" , "Drive off it, half-tittering" .)