… something conical in a chemistry lab

ERLENMEYERFLASK

This wide-based, narrow-necked glass container is a staple for mixing solutions.

The clue hints at a common piece of lab equipment with a conical shape, which is the Erlenmeyer flask. The answer is written as one continuous word without spaces, as is typical in crosswords. The flask is named after its inventor, Emil Erlenmeyer, and is widely used in chemistry for mixing and heating liquids. The wordplay here is straightforward, focusing on the shape and purpose of the item.