Eric Austin's variation on a Mike Lawson extended body drake. Tied here as a Brown; change color/size to suit your needs. Probably a leader twister; this one's just for fun.
hook - Dai Riki 300 #10
thread - UTC 140 yellow
tail - woodduck flank
abdomen - tying thread
rib - brown hackle stem
thorax - dubbing dirty yellow
wing - partridge
hackle - brown
Part 1
mash barb, start thread, wrap to point above barb
prep woodduck
measure (hook length+), trim out center section; tie in/trim
i
prep 2 well-marked partridge feathers; strip fluff from stems, measure (hook length), tie in at ? mark (convex-to-convex), set angle with thread wraps