About end of dinner expert gets port (4)
I believe the answer is:
'port' is the definition.
(I've seen this before)
'about end of dinner expert' is the wordplay.
'about' indicates putting letters inside.
'end of' suggests the final letters.
'expert' becomes 'ace' (ace can informally mean very good).
The final letter of 'dinner' is 'r'.
'r' put into 'ace' is 'ACRE'.
'gets' is the link.
(Other definitions for acre that I've seen before include "Four thousand, eight hundred and forty square yards" , "Care about the land measure" , "Mediterranean port" , "Middle East port" , "Four roods - Israeli port" .)