Answer: alternate
AnswerCrossword Clue
ALTERNATESub
alternatein turns / to cause to follow by turns or one after the other (properly, of two things)
alternatebeing every second one
alternateto occur or cause to occur in turns
alternatesubstitute
ALTERNATEDo this, then that, then this again
ALTERNATEStand-in
ALTERNATEEvery second
ALTERNATEChange neat arrangement every second (9)
ALTERNATEWhat black and white squares do on a chessboard
ALTERNATEHow to shake up Etna?
ALTERNATEVice, so to speak
ALTERNATEKind of juror
ALTERNATESubstitute
ALTERNATEReciprocal.
ALTERNATEVary by turns.
ALTERNATEDeputy
ALTERNATETake turns
ALTERNATEBackup