Using Router as Range Extender

[Citroënbender]

I’m not sure if this is possible; that’s a big part of my query.

The new router came with Telstra’s NBN two weeks ago; a fancy thing and apparently the latest/greatest from them. My old router is old; an Archer D5 from TP-Link’s AC1200 series. 802.11ac/b/g/n wifi standards.

What I’m wondering about, is.

Can I configure it as a range extender, but in a way that allows its Ethernet ports to be used by devices?

I’ve done some reading, but starting to get confused. Most writing up of how to configure devices like this as an access point, assume you have an incoming LAN signal via cable. That’s different. I want it to receive the wifi signal and then allow me to plug in an Ethernet cable to connect to a device.

So - as per the first line - is this even possible?