Dad caught one half-fish with captain in the ocean (7)
I believe the answer is:
pacific
'ocean' is the definition.
(I know that Pacific is a ocean)
'dad caught one half-fish with captain' is the wordplay.
I cannot quite see how this works, but
'dad' could be 'pa' (both can mean one's father) and 'pa' is found within the answer.
'caught' could be 'c' (cricket abbreviation) and 'c' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'in the' acts as a link.
Can you help me to learn more?
(Other definitions for pacific that I've seen before include "mild" , "A great ocean" , "Peaceful in intent" , "water" , "Serene - ocean" .)