Dancing pair get through, united together (4,5)
I believe the answer is:
pari passu
'together' is the definition.
(I've seen this before)
'dancing pair get through united' is the wordplay.
'dancing' indicates anagramming the letters.
'get through' becomes 'pass' (I've seen this before).
'united' becomes 'u'.
'pair' anagrammed gives 'pari'.
'pari'+'pass'+'u'='PARI PASSU'
(Other definitions for pari passu that I've seen before include "Together" , "Simultaneously" .)