Run and run, entering race (6)
I believe the answer is:
stream
This clue is a quadruple definition!!
'run' is the first definition.
(I know that stream is a type of run)
'and' is a link.
'run' is the second definition.
(streaming is a kind of running)
'entering' is the third definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'race' is the fourth definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for stream that I've seen before include "Small watercourse" , "Brook or small river" , "Flow of water on land" , "Constant flow of liquid" , "Master of a tributary" .)