What stops triumph over order? (6)
I believe the answer is:
behest
'order?' is the definition.
(I've seen this before)
'what stops triumph over' is the wordplay.
'what' becomes 'eh' (sound used to ask 'what?' or 'pardon?').
'stops' means one lot of letters goes inside another (stopping can mean blocking a gap).
'triumph over' becomes 'best' (I've seen this in another clue).
'eh' put inside 'best' is 'BEHEST'.
(Other definitions for behest that I've seen before include "Command, bidding" , "(At someone's) command" , "Command - Thebes (anag)" , "Order" .)