River that makes a U-bend (6)
I believe the answer is:
danube
'river' is the definition.
(Danube is an example)
'makes a u-bend' is the wordplay.
'makes' indicates an anagram.
'a'+'u'+'bend'='aubend'
'aubend' anagrammed gives 'DANUBE'.
'that' is the link.
(Other definitions for danube that I've seen before include "It's blue according to the song" , "Major European river" , "River in Europe" , "Great European river, musically blue (6)" , "Vienna's river" .)