Crossword Genius

Monks heading for Hell, largest first? (10,5)

Ross

I believe the answer is:

descending order

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

'heading for hell largest first?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'monks' is the wordplay.
I cannot quite understand how this works, but
'monks' could be 'order' and 'order' is present in the answer.
The remaining letters 'descending' is a valid word which might be clued in a way I don't understand.
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 Guardian.
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