_{This puzzle is a part of the Monthly Topic Challenge #4: Cross-*non*-words}

Giving clues for every part makes issues approach too easy. In this crossword, 4 clues are usually not given and you need to discover a technique to fill each cell of the grid utilizing the clues supplied, together with discovering appropriate solutions to the unclued entries.

1. Portrayed by Hugo Weaving, this movie character hides his face behind a Guy Fawkes masks
2. Expression for “softly” in sheet music
3. Notation for a kiss on the finish of a letter, for instance
4. The image on the entrance of vehicles manufactured by Elon Musk’s firm
5. –
6. On treasure maps, the spot the place one ought to dig
7. Mechanical work, in physics
8. In chess notation, the piece that may soar over different items
9. Number whose sq. is −1
10. –
11. On pencils, “wonderful”
12. –
13. –