Flower in Antarctica magical (3)

I believe the answer is:

cam

'flower' is the definition.
(river in Cambridge, England)

'in antarctica magical' is the wordplay.
'in' indicates the answer is hidden within the clue.
'CAM' can be found hidden inside 'antarctica magical'.

(Other definitions for cam that I've seen before include "Bump on a shaft for pushing another shaft" , "Projection on rotating cylinder" , "Tributary of the Ouse" , "Runner" , "Rotating part in machine; river" .)

I've seen this clue in The Sun.

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