Answer: concentrating

AnswerCrossword Clue
concentratingDo or deal with (one particular thing) above all others
concentratingCONCENTRATE, to bring or direct toward a common center or objective
concentratingGather (people or things) together in numbers or in a mass to one point
concentratingCome together in this way
concentratingIncrease the strength or proportion of (a substance or solution) by removing or reducing the water or any other diluting agent or by selective accumulation of atoms or molecules
concentratingFocus one's attention or mental effort on a particular object or activity