Crossword Genius

When the dynamo broke down? (6)

Ross

I believe the answer is:

monday

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'broke down?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'when the dynamo' is the wordplay.
'dynamo' can be anagrammed to 'MONDAY'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for monday that I've seen before include "May nod (anag.)" , "Start of the working week" , "First weekday" , "Part of the week" , "Dynamo (anag.)" .)

I've seen this clue in The Irish Independent.
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