Support garment (3)
I believe the answer is:
tee
This might be a double definition.
'support' is the first definition.
(I know that tee is a type of support)
'garment' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for tee that I've seen before include "'Drive off it, half-laughing (3)'" , "Starting place for a golfer" , "Golf ball support" , "support of leisure activity" , "Starting place on the golf course" .)