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!