Shark or dog taking pee first (9)
I believe the answer is:
'shark' is the definition.
(I know that porbeagle is a type of mackerel shark)
'or dog taking pee first' is the wordplay.
'dog' becomes 'beagle' (beagle is a kind of dog).
'taking pee' becomes 'p' (I am not sure about the 'taking' bit.).
'first' says to put letters next to each other.
'orbeagle' put after 'p' is 'PORBEAGLE'.
Can you help me to learn more?
(Other definitions for porbeagle that I've seen before include "Shark" , "Swimmer" .)