Friendly leaders of African tribe parting eventually (8)
I believe the answer is:
intimate
'friendly' is the definition.
(I've seen this before)
'leaders of african tribe parting eventually' is the wordplay.
'leaders of' suggests taking the first letters.
'parting' is an insertion indicator.
'eventually' becomes 'intime' (synonyms).
The first letters of 'african tribe' is 'at'.
'at' going within 'intime' is 'INTIMATE'.
(Other definitions for intimate that I've seen before include "Bosom" , "Closely acquainted" , "Private and personal like close acquaintanceship" , "cosy" , "Tip off" .)