At home a brother finally raises being behind with payments (2,7)
I believe the answer is:
in arrears
'behind with payments' is the definition.
(I've seen this before)
'at home a brother finally raises' is the wordplay.
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'finally' says to take the final letters.
'raises' becomes 'rears' (rearing is a kind of raising**).
The last letter of 'brother' is 'r'.
'in'+'a'+'r'+'rears'='IN ARREARS'
'being' is the link.
(Other definitions for in arrears that I've seen before include "Overdue" , "Position when a debt remains unpaid after its due date" , "Behindhand (with rent)" , "Behind with payments" , "Owing" .)