Weight: wrap lead wire up most of the shank, leaving room at the front for the hackle and head. Before cutting the wire, wrap a second layer back over about half of the first to build a taper, then break the wire off and slide the wraps into position.
Start the black thread, build a small dam of wraps behind and in front of the wire, ramp the thread over the two levels of wire, and take the thread back to the bend.
Tail: mix a few brown and grizzly hackle fibers and tie them in a shade longer than one hook gap. Secure and trim the butts.
Body: pull the guard hairs out of a pinch of muskrat underfur and spin a fairly tight noodle. Dub a buggy body forward over the weight. It will take two or three applications, stopping short of the eye.
Tie in a brown and a grizzly hackle together at the front of the body, tips forward, and trim the butts.
Wrap the grizzly one to one and a half turns and follow it with the same amount of brown, then tie both off and trim. This is a sparse wet-fly collar, not a dry fly hackle.
Stroke the hackle fibers back like a soft hackle and build a fairly heavy thread head, ramping it up so the fibers lie swept back along the body.
Whip finish four or five turns and add a drop of head cement. Leave the fly buggy and scruffy, no cleanup needed.