Reflectors make it less bright for the fearful (5)

I believe the answer is:

timid

I'm a little stuck... Click here to teach me more about this clue!

'for the fearful' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for timid that I've seen before include "Easily scared" , "Mouse" , "Easily frightened" , "Shrinking" , "Fearful - shy" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app