Scramble around branch (5)
I believe the answer is:
climb
'scramble' is the definition.
(I know that scramble is a more specific form of the action climb)
'around branch' is the wordplay.
'around' becomes 'c' (abbreviation for 'circa').
'branch' becomes 'limb' (I've seen this before).
'c'+'limb'='CLIMB'
(Other definitions for climb that I've seen before include "Scale or clamber" , "Soar" , "Go upwards" , "Move upwards, ascend" , "Ascend, escalate" .)