Witch of Carthage? (3)

I believe the answer is:

hag

'witch' is the definition.
('hag' can be a synonym of 'witch')

'of carthage?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'HAG' is hidden within 'carthage'.

(Other definitions for hag that I've seen before include "Old witch-like woman" , "Crone" , "Witch or ugly old woman" .)

I've seen this clue in the Evening Standard.

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