Water creature caught in a small boat (4)
I believe the answer is:
crab
'water creature' is the definition.
'crab' can be an answer for 'creature' (crab is a kind of creature). I am not sure about the 'water' bit.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for crab that I've seen before include "accidentally caught in a row?" , "Sourpuss < to wreck" , "The constellation Cancer" , "A sea creature; an apple" , "Stalk-eyed crustacean" .)