White House perhaps has one good bathroom (5)
I believe the answer is:
igloo
'white house' is the definition.
(an igloo is made of snow)
'one good bathroom' is the wordplay.
'one' becomes 'i' (Roman numeral).
'good' becomes 'g' (abbreviation).
'bathroom' becomes 'loo' (loo is a kind of bathroom).
'i'+'g'+'loo'='IGLOO'
'perhaps has' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for igloo that I've seen before include "Hut built of snow" , "Inuit dwelling" , "Ice house for Eskimo" , "basic dwelling" , "Living quarters" .)