Answer: beon

AnswerCrossword Clue
BEON".. your toes!"
BEONAir
BEONWords before guard or time
BEON.. one's toes (stay alert)
BEON"A ginooine statesman should ... his guard": J. R. Lowell
BEON"... the alert!"
BEON"... the lookout!"
BEON"... your best behavior"
BEON"... your toes!"
BEON'Just to -- the safe side ...'
BEON"Just to ... the safe side ..."