Goal part (8)
I believe the answer is:
crossbar
'goal part' is the definition.
('crossbar' is part of 'goal')
This is all the clue.
(Other definitions for crossbar that I've seen before include "one's seen on a bike?" , "Bit of sports equipment" , "Horizontal piece, on a bicycle say" , "It may support rider" , "Top football goal" .)