Dismounts after cycling with little impact (6)
I believe the answer is:
lights
'dismounts' is the definition.
('light' can be a synonym of 'dismount')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lights that I've seen before include "Illuminations or entrails" , "Offal" , "Understanding" , "Fairy _;" , "Windows" .)