US state uniform and headgear making comeback (4)
I believe the answer is:
utah
'us state' is the definition.
(I've seen this before)
'uniform and headgear making comeback' is the wordplay.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'and' says to put letters next to each other.
'headgear' becomes 'hat' (hat is a kind of headgear).
'making comeback' is a reversal indicator.
'hat' back-to-front is 'tah'.
'u'+'tah'='UTAH'
(Other definitions for utah that I've seen before include "American location" , "US state, capital Salt Lake City" , "The American Mormon state" , "Brigham Young's state" , "State founded by Mormon" .)