Extremely nice lunch forged deep international connection (7)
I believe the answer is:
chunnel
'deep international connection' is the definition.
(informal term for the Channel Tunnel)
'extremely nice lunch forged' is the wordplay.
'extremely' suggests removing the centre.
'forged' indicates an anagram.
'nice' with its middle taken out is 'ne'.
'ne'+'lunch'='nelunch'
'nelunch' with letters rearranged gives 'CHUNNEL'.
(Other definitions for chunnel that I've seen before include "Kent/Pas-de-Calais link" , "Anglo-French link" , "Railway passage between England and France" .)