29632062lql3,
You can also:
1) Create a black fill/nostroke rectangle with a width equalling the desired cutout of the lower hexagon at the upper left (or lower right intersection) and centred on the left vertical part of the other/upper hexagon;
2) Rotate 5 copies of the rectangle made in 1) round the centre of the artwork with the Rotate Tool at 60 degrees;
3) Select each rectangle and the corresponding lower hexagon and click Make (Opacity) Mask in the Transparency panel.
This ought to hide the undesired parts of the lower hexagons.
You can determine the centre in different ways, unless known already.
You can look up relevant explanations by a search here (empty, ready for insertion, ignore error message), add Illustrator to avoid hits for other applications, choose pages and read/search in them:
https://helpx.adobe.com/search-results.html?q=&scope=%5B%22helpx%22%5D&subscope=%5B%5D&limit=10&start_index=0&sort_orderby=relevancy&sort_order=desc&post_facet_filters=%7B%22applicable_products%22%3A%5B%5D%7D
Edit: Hi Mylenium, still feels like early spring here.