Henri abused German runner (5)
I believe the answer is:
rhine
'german runner' is the definition.
'Rhine' can be an answer for 'runner' (Rhine River is an example). I am not sure about the 'german' bit.
'henri abused' is the wordplay.
'abused' indicates an anagram.
'henri' anagrammed gives 'RHINE'.
Can you help me to learn more?
(Other definitions for rhine that I've seen before include "valley" , "River at Bonn, Koln" , "Major European river" , "Bonn's river" , "River, rising in Switzerland and flowing into the North Sea" .)