Full house, in poker slang (4)
I believe the answer is:
boat
'full house in poker slang' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for boat that I've seen before include "Water (or gravy) vessel" , "Eg, coracle" , "Small vessel" , "See 1" , "Vessel for water travel" .)