Separated a section (5)
I believe the answer is:
apart
'separated' is the definition.
(synonyms)
'a section' is the wordplay.
'section' becomes 'part' (synonyms).
'a'+'part'='APART'
(Other definitions for apart that I've seen before include "Separated or at a distance" , "in isolation" , "out on a limb?" , "Unconnected" , "Separate in a trap" .)