Crossword Genius

Having been got at inside, is defeated (6)

Ross

I believe the answer is:

beaten

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

'is defeated' is the definition.
(similar in meaning)

'having been got at' is the wordplay.
I cannot really understand how this works, but
'got' could be 'eaten' (I've seen this before) and 'eaten' is present in the answer.
A single letter 'b' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'inside' is the link.

Can you help me to learn more?

(Other definitions for beaten that I've seen before include "Defeated or mixed vigorously" , "Trounced" , "Defeated or overcome" , "Struck; defeated" , "Failed to win - punished" .)

I've seen this clue in the Evening Standard.
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