Dumbbell, eg (6)
I believe the answer is:
weight
'dumbbell eg' is the definition.
(I know that dumbbell is a type of weight)
This is all the clue.
(Other definitions for weight that I've seen before include "Significance" , "Attach importance to" , "The property of heaviness, measure of mass" , "Avoir-du-pois" , "Relative heaviness" .)