Stipulated condition (7)
I believe the answer is:
proviso
'stipulated condition' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for proviso that I've seen before include "Stipulation (in contract)" , "Condition added to an agreement" , "Condition for VIP or so" , "Condition of stipulation of an agreement" , "Condition, qualification" .)