Crossword Genius

Keeps on edge? (11)

Ross

I believe the answer is:

sandcastles

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

'edge?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'keeps' is the wordplay.
I cannot quite understand how this works, but
'keeps' could be 'castles' (I've seen this before) and 'castles' is found within the answer.
The remaining letters 'sand' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'on' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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