A constituent that's divorced? (5)
I believe the answer is:
apart
'divorced?' is the definition.
(I've seen this before)
'a constituent' is the wordplay.
'constituent' becomes 'part' (I've seen this before**).
'a'+'part'='APART'
'that's' is the link.
(Other definitions for apart that I've seen before include "out on a limb?" , "Cut off - in pieces" , "Separated physically" , "Estranged - in pieces" , "set aside" .)