Spot/partial metering while using TTL flash?
On my 6D under the speedlight control menu is the option to set how flash works in Av mode.
1 Auto - Shutter speed will set to include ambient
2 Shutter speed adjusts between 1/60 and 1/180
3 Shutter speed set to 1/180
Option 1 will drag the shutter giving you both an ambient and flash exposure.
Option 2 and 3 will reduce ambinet to black indoors under most lighting