Puzzled? Boatman might be (2,3)
I believe the answer is:
at sea
'puzzled?' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for at sea that I've seen before include "'Filled with bewilderment (2,3)'" , "disorientated" , "Worse things can happen here" , "stumped" , "Sailing off shore" .)