Crossword Genius

Port drink knocked back with tea - hazard a guess what it is? (7)

Ross

I believe the answer is:

predict

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

'port' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for predict that I've seen before include "Estimate consequence of" , "Foresee" , "Prophesy - portend" , "Forecast" , "Guess (the future)" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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