In spite of the uniform (4)
I believe the answer is:
even
I believe this clue is a double definition.
'in spite of' is the first definition.
(thesaurus)
'the uniform' is the second definition.
(I've seen this before)
(Other definitions for even that I've seen before include "Not easily annoyed" , "Flush" , "night" , "Level, straight or regular" , "Peaceful" .)