A carriage overturned to one side (5)
I believe the answer is:
apart
'to one side' is the definition.
(thesaurus)
'a carriage overturned' is the wordplay.
'carriage' becomes 'trap' (trap is a kind of carriage**).
'overturned' says the letters should be written in reverse.
'trap' in reverse letter order is 'part'.
'a'+'part'='APART'
(Other definitions for apart that I've seen before include "Unconnected" , "out on a limb?" , "divorced" , "cut off from others" , "First Christmas present from my love" .)