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This black magic is called twentyfive years of experience.
It is very nice, however, there is no fast way to get it !

To give some clues, it is 'clearly' Phasiinae, that is, the subfamily with usually few bristles, often rather Syrphid-like.
The topcell is open.
The general habitus points at either Eliozeta or Clytiomyia.
And then it is easy, the third antennal segment is much longer than broad and the arista is thickened over much more than basal half. All of this points to only 1 species:
Eliozeta pellucens

A female (males have the vertex much smaller).

Theo