The goal is simple: solve the cryptic clues to get a Only-Connect wall, consisting of 16 words, which then must be grouped into 4 groups of 4 words each sharing a common property.
| Investigate the beginnings of combinatorics (4) | Clean the dirty leader Donald Trump around us (4) | Learn muddled stream (6) | Look for StackExchange curve (6) |
| A dove-cat confuses lawyer (8) | Domestic animal behind vehicle that lies on the floor (6) | Source of life; for example, great leader (3) | Overflow cuisine, around fifty (5) |
| Wild fleas know small piece of ice (9) | Talented metalloid returning in America (6) | Notice broken post (4) | Option: carbon, hydrogen, oxygen and ice (6) |
| DNA, mouse or producer (9) | Tart is crazy painter (6) | Bunch of steps reportedly gaze at the situation (9) | A fruit begins life in modern Europe (4) |
Also, this is my first try at cryptic-clues, so I welcome feedback!