Crossword Genius

Amount of work produced by Verne they say (6)

Ross

I believe the answer is:

joules

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

'amount' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.

'of work produced by verne they say' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
'verne' could be 'jules' (I've seen this in another clue) and 'jules' is found within the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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