Indian queen reversing, backs behind (2,7)
I believe the answer is:
in arrears
'behind' is the definition.
(thesaurus)
'indian queen reversing backs' is the wordplay.
'indian queen' becomes 'rani' (I've seen this before).
'reversing' is a reversal indicator.
'backs' becomes 'rears' ('rear' can be a synonym of 'back').
'rani' back-to-front is 'inar'.
'inar'+'rears'='IN ARREARS'
(Other definitions for in arrears that I've seen before include "Late with payments" , "Position when a debt remains unpaid after its due date" , "Owing" , "Behindhand (with rent)" , "Rare rains beyond the due time" .)