Crossword Genius

Nibbled sandwiches on central estate (7)

Ross

I believe the answer is:

battier

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

'nibbled sandwiches' is the definition.
The definition and answer are not the same part of speech.

'on central estate' is the wordplay.
I cannot really understand how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for battier that I've seen is " More insane".)

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