Answer: uptake

AnswerCrossword Clue
UPTAKESlow on the ... (thickheaded)
uptakeabsorption
uptakepipe or passage leading upward from below, as for conducting smoke or a current of air
uptakeapprehension; understanding or comprehension; mental grasp
uptaketo take up
uptakeact or instance of taking up; lifting
UPTAKEQuick on the ..
UPTAKEQuick on the ... (smart)
UPTAKESlow on the ... (not smart)
UPTAKEThe dim are slow on it
UPTAKESlow on the ...
UPTAKESlow on the ... (dense)
UPTAKEComprehension
UPTAKEVentilating shaft
UPTAKEUnderstanding.
UPTAKEUnderstanding: Colloq.
UPTAKECapacity for understanding.
UPTAKEComprehension.
UPTAKEQuick on the ...
UPTAKEUnderstanding
UPTAKEQuick on the ..: smart
UPTAKEGrasp
UPTAKEAbsorption
UPTAKEMental grasp