Crossword Genius

Imprisoned wrongly in old age (6)

Ross

I believe the answer is:

gaoled

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

'imprisoned' is the definition.
('gaol' can be a synonym of 'imprison')

'wrongly in old age' is the wordplay.
'old age' can be anagrammed to 'GAOLED'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Another definition for gaoled that I've seen is " Put away".)

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