Minor branches, one understands (5)
I believe the answer is:
twigs
This clue could be a double definition.
'minor branches' is the first definition.
'twigs' can be an answer for 'branches' (twig is a kind of branch). I am not certain of the 'minor' bit.
'one understands' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for twigs that I've seen before include "Catches on" , "Slender (tree) shoots" , "Kindling" , "Slender woody shoots" , "Small branches" .)