Indian perhaps back with uniform (5)
I believe the answer is:
hindu
'indian' is the definition.
(I've seen this before)
'back with uniform' is the wordplay.
'back' becomes 'hind' (synonyms).
'with' means one lot of letters go next to another.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'hind'+'u'='HINDU'
'perhaps' is the link.
(Other definitions for hindu that I've seen before include "Central Asian mountain range" , "Member of religious group" , "Adherent of an Asian religion" , "Member of great Indian religion with belief in reincarnation" , "One practising an Indian religion" .)