Drone-like hoverfly on ash tree

Drone-like hoverfly on ash tree

Observation - Drone-like hoverfly on ash tree - UK and Ireland. Description: This looks to me like an individual that has just emerged and is in process of cleaning itself up; I photographed it over a period of five minutes without it flying off. In one image, the arrowed structure showed surface projections and I am wondering w

This looks to me like an individual that has just emerged and is in process of cleaning itself up; I photographed it over a period of five minutes without it flying off.
In one image, the arrowed structure showed surface projections and I am wondering what it is – a form of tongue?