Somewhat economical, I'm on yield-based split payment (7)
I believe the answer is:
alimony
'split payment' is the definition.
'alimony' can be an answer for 'payment' (alimony is a kind of payment). I'm unsure of the 'split' bit.
'somewhat economical i'm on yield-based' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'ALIMONY' is hidden within 'economical im on yield based'.
Can you help me to learn more?
(Other definitions for alimony that I've seen before include "Payment to divorcee" , "Payments by spouse to divorced partner" , "Allowance paid to divorced person" , "financial support separately provided" , "Divorce settlement" .)