Come on all you know-alls - this clue means nothing to me! 33a Form of electromagnetic radiation around 400-740 nm (5) ?I?H? Thank you in anticipation.
Why not join in the Saturday KM links competition? The answer to your clue was given (one of the four shaded clues in this morning's paper). The idea is to match those words to the shaded squares in the Monday Herculis competition in the Telegraph. Clues appear early on Saturday morning. There is also an MM links game just for fun where the clues are set by other Answer Bank worthies and this appears at 9.00 a.m. on Saturday. It's good fun and very addictive!