Chicken and port (7)

I believe the answer is:

leghorn

I believe this is a double definition.

'chicken' is the first definition.
(I've seen this before)

'port' is the second definition.
(I've seen this before)

'and' is the link.

(Other definitions for leghorn that I've seen before include "Chicken; straw hat" , "Breed of domestic foul" , "port" , "Breed of chicken" .)

I've seen this clue in The Telegraph, The Guardian and The Globe and Mail.

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