First lady given new uniform (4)
I believe the answer is:
even
'uniform' is the definition.
(I've seen this in another clue)
'first lady given new' is the wordplay.
'first lady' becomes 'eve' (first woman in the Bible).
'given' means one lot of letters go next to another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'eve'+'n'='EVEN'
(Other definitions for even that I've seen before include "Equally balanced; level" , "Like 2018 but not 2017" , "Placid - not easily angered" , "end of the day, reading poetry" , "Like half the numbers" .)