Cessation of war no longer constant? Correct (4)
I believe the answer is:
true
'correct' is the definition.
(associated in meaning)
'cessation of war no longer constant?' is the wordplay.
'cessation of war' becomes 'truce' (I've seen this in another clue).
'no longer' is a deletion indicator.
'constant?' becomes 'c' (common symbol in maths for an unknown constant).
'truce' with 'c' removed is 'TRUE'.
(Other definitions for true that I've seen before include "Veritable" , "Straight or loyal" , "Exact, factual" , "Right; genuine" , "Agreeing with fact or reality" .)