Live what's left out of uniform (6)
I believe the answer is:
reside
'live' is the definition.
(I know that reside is a more specific form of the action live)
'what's left out of uniform' is the wordplay.
'what's left' becomes 'rest' (I've seen this in other clues).
'out' means to remove the last letter.
'of uniform' becomes 'ide' (I am not sure about this - if you are sure you should believe this answer much more).
'rest' with its final letter removed is 'res'.
'res'+'ide'='RESIDE'
(Other definitions for reside that I've seen before include "Make one's home permanently" , "Desire (anag) - to live" , "Lodge" , "Occupy a place" , "Dwell - settle" .)