I'm down to the last 3 clues...
15D Asian providing turned cheek in love (8)
- I - I - - - O
I'm thinking it's filipino, in + o (for love) at the end but why 'turned cheek'?
23A Milk is sustaining English peoples (7)
L - I - - - S
5th would be 'I' if filipino's correct.
22D Old copper leaving old country with pullover (5)
R - A - A
This site gave me reata or riata, a lariat, which is a nice connection with 'pullover'! I guess old copper is OCU or OPC or some other police rank, but I have no idea what that makes the old country or which spelling is correct.