Reserve chambers in igloos? (9)

I believe the answer is:

icehouses

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

'igloos?' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe you can see an association between them that I can't see?

'reserve chambers' is the wordplay.
'reserve' becomes 'ice' (I've seen this before).
'chambers' becomes 'houses' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ice'+'houses'='ICEHOUSES'

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Hindu.

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