Answer: tossin

AnswerCrossword Clue
TOSSINAdd as a bonus
TOSSINAdd casually
TOSSINAdd
TOSSIN... the towel
TOSSIN... the towel (cede)
TOSSINCasually add
TOSSINGive, as a little extra
TOSSINInclude, so as to sweeten the pot
TOSSINJoan Jett did this with her "Turnin'"
TOSSINKingsmen "... and Turnin'"
TOSSINInclude for free
TOSSINAdd at no extra cost