Unvarying, consistent (7)
I believe the answer is:
uniform
This clue is a double definition.
'unvarying' is the first definition.
(synonyms)
'consistent' is the second definition.
(synonyms)
(Other definitions for uniform that I've seen before include "Regular - formal dress" , "Regimentals" , "Regular sort of formal outfit" , "Military clothing" , "Alike all over" .)