Bluedye

1 clue
Indigotine, for instance
Similar answers:
Ablue
Abluent
Ablur
Ablush
Ablution
Afroblue
Againstthineownbluesky
Aliceblue
Amiblue
Andblue
Apatchofblue
Aquablue
Areblue
Arebluewinteris
Atebluegrass
Atfirstblush
Avioletisntblue
Azoblue
Azureblue
Babethebluefox