Stipulate the condition (5)
I believe the answer is:
state
I believe this clue is a double definition.
'stipulate' is the first definition.
(thesaurus)
'the condition' is the second definition.
(thesaurus)
(Other definitions for state that I've seen before include "eg Alaska" , "Condition - sovereign political power" , "Georgia < or Virginia" , "Pomp; nation" , "Claim" .)