Allowed in the event (8)
I believe the answer is:
provided
This clue is a double definition.
'allowed' is the first definition.
(allow can mean to provide or supply)
'in the event' is the second definition.
(both can mean 'in certain conditions...')
(Other definitions for provided that I've seen before include "furnished" , "... on understanding that" , "Given" , "in the event" , "If - supplied" .)