Go up and get caught on branch of tree (5)
I believe the answer is:
climb
'go up' is the definition.
(I know that climb is a more specific form of the action go up)
'get caught on branch of tree' is the wordplay.
'get' becomes 'see' (both can mean to understand).
'caught' indicates a 'sounds like' (homophone) clue (heard).
'on' is a charade indicator (letters next to each other).
'branch of tree' becomes 'limb' (I've seen this before).
'see' is a homophone of 'c'.
'c'+'limb'='CLIMB'
'and' is the link.
(Other definitions for climb that I've seen before include "showing the way up" , "Use hands and feet to rise" , "Go up - scale" , "Rise (in value, status)" , "Soar" .)