Small amounts put on horses (4)
I believe the answer is:
bits
This clue could be a double definition.
'small amounts' is the first definition.
(I've seen this in another clue)
'on horses' is the second definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?
'put' acts as a link.
Can you help me to learn more?
(Other definitions for bits that I've seen before include "Small pieces" , "Small units of digital memory" , "Parts" , "Pieces, fragments" .)