Weight (3)
'weight' is the definition.
(unit of weight)
This is the entire clue.
(Other definitions for ton that I've seen before include "Two thousand - two hundred and forty pounds" , "A slang 100mph - heavy" , "See 25" , "Two thousand, two hundred and forty lbs avoirdupois" , "People of fashion" .)
'weight' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for onus that I've seen before include "Weight of responsibility" , "Duty or responsibility" , "Obligation - charge" , "Responsibilty" , "'Burden, of proof (4)'" .)
'weight' is the definition.
(heft is a kind of weight)
This is all the clue.
(Other definitions for heft that I've seen before include "Lift (something heavy)" , "Lift or hold something to assess its weight" , "Feel the weight of" , "Judge the weight" , "Lift, carry; influence" .)
'weight' is the definition.
(unit of weight)
This is all the clue.
(Other definitions for ounce that I've seen before include "not weighing very much" , "Approx. twenty-eight gm" , "One-sixteenth of pound" , "Wild animal" , "Wild cat - small weight" .)
'weight' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for emphasis that I've seen before include "Force" , "Stress, accent" , "Stress, special importance" , "Stress given to a word" , "Stress laid on, eg, words" .)