Mxsmanic wrote:

What does "Engineer's clearance received" mean in a preflight
checklist for a commercial airliner? This is in a 737, which doesn't
have a flight engineer, so I don't know what it's supposed to cover.

Why don't you take your airliner questions over to...
http://www.pprune.org/forums/forumdisplay.php?f=3

I'm sure they'd be thrilled to help you.