Flummoxed on the ocean wave (2,3)
I believe the answer is:
at sea
'flummoxed' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs occasionally mean the same thing.
'on the ocean wave' is the wordplay.
I cannot really see how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is located in the answer.
'ocean' could be 'sea' (synonyms) and 'sea' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for at sea that I've seen before include "floundering" , "Having difficulty understanding" , "Lost or confused - on the briny?" , "All bothered and bewildered" , "Totally disorganised" .)