Answer: makeweight

AnswerCrossword Clue
MAKEWEIGHTSomething thrown in to avoid a shortage.
makeweighta small quantity added to make up a certain weight eg an extra slice of bread; hence, an insignificant person or thing
makeweightSomething put on a scale to make up the required weight
makeweightAn extra person or thing needed to complete something; a filler
makeweightAn unimportant point added to make an argument seem stronger