One good bathroom in a summer house (5)

I believe the answer is:

igloo

I'm a little stuck... Click here to teach me more about this clue!

'a summer house' is the definition.
'igloo' can be an answer for 'house' (I've seen this before). I am not sure about the 'a summer' bit.

'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'

'in' is the link.

Can you help me to learn more?

(Other definitions for igloo that I've seen before include "basic dwelling" , "Inuit ice house" , "Inuit shelter" , "Snow-house" , "Arctic home" .)

I've seen this clue in The Hindu.

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