Setter's cheering when cycling (7)
I believe the answer is:
gelatin
'setter's' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for gelatin that I've seen before include "Colourless protein extracted from animal bones" , "something gluey" , "Glue made from animal extracts" , "Food/glue jelly" , "Jelling agent" .)