Completely out of port and can't explain why? (3,2,3)
I believe the answer is:
all at sea
'can't explain why?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'completely out of port' is the wordplay.
'completely' becomes 'all' (synonyms).
'out of port' becomes 'atsea' (I've seen this in another clue).
'all'+'atsea'='ALL AT SEA'
'and' is the link.
Can you help me to learn more?
(Other definitions for all at sea that I've seen before include "Entire crew" , "Confused, uncertain" , "Rescuers at Dunkirk were thus" , "Utterly confused, totally on the ocean" , "Completely confused on voyage?" .)