Piece of the woodwork from pub on bridge (8)
I believe the answer is:
crossbar
'piece of the woodwork' is the definition.
(woodwork can mean a goal on a football pitch)
'pub on bridge' is the wordplay.
'pub' becomes 'bar' (both are drinking establishments).
'on' means one lot of letters go next to another.
'bridge' becomes 'cross' (bridge can mean to cross over).
'bar' put after 'cross' is 'CROSSBAR'.
'from' acts as a link.
(Other definitions for crossbar that I've seen before include "member over goal" , "Bit of sports equipment" , "one's seen on a bike?" , "It's over the goalie's head" , "One of two on football field" .)