Tolerate branches which display official heraldic symbols (4,4)
I believe the answer is:
bear arms
'display official heraldic symbols' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'tolerate branches' is the wordplay.
'tolerate' becomes 'bear' (synonyms).
'branches' becomes 'arms' (arm can mean a branch).
'bear'+'arms'='BEAR ARMS'
'which' acts as a link.
Can you help me to learn more?
(Other definitions for bear arms that I've seen before include "Carry weapons" , "Serve as a soldier" , "Serve in the forces" , "they may be used in a tight squeeze!" , "right for American?" .)