A fly from the Robber flies (Asilidae) family, Diotricia hyalipennis [1, 2].
It came flying in near to the ground to consume a prey it just caught. The antenna and large eyes make this small fly stand out. After quickly finishing its snack the fly moved on again.
Unfortunately not a very good photograph but the insect is fairly clearly visible. And although a common species it is not something you’ll encounter on a daily basis so we allow it 😅.
References1 Nederlands Soortenregister
2 Reinoud van den Broek, André Schulten, Roofvliegen van Nederland en België inclusief Denemarken en de Britse Eilanden (Diptera – Asilidae), 2013