A carriage returns separately (5)
I believe the answer is:
apart
'separately' is the definition.
(thesaurus)
'a carriage returns' is the wordplay.
'carriage' becomes 'trap' (trap is a kind of carriage**).
'returns' says the letters should be written backwards.
'trap' written backwards gives 'part'.
'a'+'part'='APART'
(Other definitions for apart that I've seen before include "In private" , "Unconnected" , "Isolated" , "Separate in a trap" , "away" .)