Confused notice at canal, or the pond (8,5)
I believe the answer is:
atlantic ocean
'the pond' is the definition.
'confused notice at canal' is the wordplay.
'confused' indicates an anagram.
'notice'+'at'+'canal'='noticeatcanal'
'noticeatcanal' is an anagram of 'ATLANTIC OCEAN'.
'or' is the link.
(Other definitions for atlantic ocean that I've seen before include "It includes Sargasso sea" , "Large sea" , "Large expanse of water" , "link between Europe and America" .)