Taking lead from a South African (deceased), act like Tarzan (7)
I believe the answer is:
ululate
'act like tarzan' is the definition.
(Tarzan famously wailed or ululated)
'taking lead from a south african deceased' is the wordplay.
'taking lead from' means to remove the first letter.
'a south african' becomes 'zulu' (I've seen this before).
'deceased' becomes 'late' (I've seen this before).
'zulu' with its initial letter taken away is 'ulu'.
'ulu'+'late'='ULULATE'
(Other definitions for ululate that I've seen before include "Howl, wail, screech" , "Wail in grief" , "Keen" , "Express grief" , "Emit long, loud wails" .)