Noteworthy bridge contains a combination of different elements (6)
I believe the answer is:
hybrid
'a combination of different elements' is the definition.
(a hybrid is a mixture or combination)
'noteworthy bridge contains' is the wordplay.
'contains' says the answer is hidden in the clue.
'HYBRID' can be found hidden inside 'noteworthy bridge'.
(Other definitions for hybrid that I've seen before include "Like a mule" , "Compound, mixture" , "Offspring of two different species or varieties" , "(One) of mixed origin" , "Plant bred from two varieties" .)