The same throughout (7)
I believe the answer is:
uniform
'the same throughout' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for uniform that I've seen before include "Regular sort of formal outfit" , "Steady, unchanging" , "The same throughout" , "Official attire" , "Dress of distinctive design worn by members of a group" .)