Cask is for port in North Africa (5)

I believe the answer is:

tunis

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'port in north africa' is the definition.
'tunis' can be an answer for 'port' (I've seen this before). I also know that 'africa' relates to this answer.

'cask is' is the wordplay.
'cask' becomes 'tun' (tun is a kind of cask).
'tun'+'is'='TUNIS'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for tunis that I've seen before include "North African location" , "North African port and capital" , "Tom, Dick or Harry" , "Carthage lies near this N. African city" , "I stun (anag) - port and capital" .)

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