Permitting everyone to be given due (8)
I believe the answer is:
allowing
'permitting' is the definition.
('allow' can be a synonym of 'permit')
'everyone to be given due' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'to be given' means one lot of letters go next to another.
'due' becomes 'owing' (similar in meaning).
'all'+'owing'='ALLOWING'
(Other definitions for allowing that I've seen before include "Permitting or conceding" , "Granting, permitting" , "Admitting" , "Giving permission" , "not stopping" .)