A bit separate (5)
I believe the answer is:
apart
'separate' is the definition.
(similar in meaning)
'a bit' is the wordplay.
'bit' becomes 'part' (I've seen this in other clues).
'a'+'part'='APART'
(Other definitions for apart that I've seen before include "Separate in a trap" , "Divided" , "Separated or at a distance" , "No longer living together" , "divorced" .)