Answer: TACKON

AnswerCrossword Clue
TACKONAdd as an afterthought
TACKONAdd later
TACKONAdd, as a rider
TACKONAppend
TACKONAdd
TACKONAdd, as an extra charge
TACKONAdd, as a rider to bill.
TACKONAdd as a supplement.
TACKONAdd as a rider
TACKONAdd for good measure
TACKONAdd penalty yardage
TACKONAdd at the last moment
TACKONSubjoin