Crossword Genius

Rue tedium, developing a form of hydrogen (9)


I believe the answer is:


I'm a little stuck... Click here to teach me more about this clue!

'a form of hydrogen' is the definition.
I can't judge whether this defines the answer.

'rue tedium developing' is the wordplay.
'developing' indicates anagramming the letters (letters developed into a new form).
'ruetedium' with letters rearranged gives 'DEUTERIUM'.

Can you help me to learn more?

I've seen this clue in The Daily Express.
Want a hint initially instead of a full solution? Install my app