A court supporting former partner? Absolutely correct (5)
I believe the answer is:
exact
'absolutely correct' is the definition.
(exactly right)
'a court supporting former partner?' is the wordplay.
'court' becomes 'ct' (abbreviation used in road names).
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'former partner?' becomes 'ex' (an ex-partner).
'a'+'ct'='act'
'act' after 'ex' is 'EXACT'.
(Other definitions for exact that I've seen before include "Rigorous" , "19 [WREST]" , "Call" , "Completely accurate" , "Precise, accurate" .)