Answer: interplay

AnswerCrossword Clue
INTERPLAYContrasting effect.
INTERPLAYReciprocal action
INTERPLAYGive-and-take
INTERPLAYReciprocal influence
INTERPLAYLiberal party line: give-and-take (9)
INTERPLAYReciprocal action and reaction
interplaymutual action / to exert mutual influence
interplayThe way in which two or more things have an effect on each other