One doing work out of the blue?

This crossword clue is for the definition: One doing work out of the blue?.
it’s A 31 letters crossword puzzle definition.
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Possible Answers: INDIGO.

Last seen on: Irish Times Crosaire – Nov 21 2020

Random information on the term “INDIGO”:

Sanjeev Dhurandhar is Professor at IUCAA, Pune. His research interest is detection and observation of Gravitational waves. Dhurandhar was part of the Indian team which contributed to the detection of gravitational waves. He is the science advisor to the IndIGO consortium council.

He was awarded one of the H K Firodia awards for 2016.

INDIGO on Wikipedia