Father in French capital wants us raised together (4,5)
I believe the answer is:
pari passu
'together' is the definition.
(Latin phrase meaning 'side by side')
'father in french capital wants us raised' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'in' means one lot of letters goes inside another.
'french capital' becomes 'Paris' (capital of France).
'wants' says to put letters next to each other.
'raised' shows that the letters should be reversed in order (going up in a down clue).
'us' backwards is 'su'.
'pa' inserted inside 'paris' is 'paripas'.
'paripas'+'su'='PARI PASSU'
(Other definitions for pari passu that I've seen before include "Together" , "Simultaneously" .)