Outfit, say, is retro; then put back? (5)

'outfit' is the definition.
(I know that outfit can be written as getup)

'say is retro then put back?' is the wordplay.
'say' becomes 'eg' (both can mean 'for example').
'is retro' says the letters should be written backwards (retro is Latin for 'backwards').
'then' is a charade indicator (letters next to each other).
'back?' says the letters should be written in reverse (I've seen 'backed' mean this).
'eg' reversed gives 'ge'.
'put' written backwards gives 'tup'.
'ge'+'tup'='GETUP'