Crossword Genius

Nationalist evicted from refined Spar food store (6)

Ross

I believe the answer is:

icebox

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

'nationalist evicted from refined' is the definition.
I can't judge whether this defines the answer.

'spar food store' is the wordplay.
I cannot really understand how this works, but
'spar' could be 'box' (I've seen this in another clue) and 'box' is found in the answer.
'food' could be 'ice' (ice is a kind of food) and 'ice' is found in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for icebox that I've seen before include "cooler" , "chiller?" , "useful in kitchen" , "Freezer compartment" , "An American fridge" .)

I've seen this clue in The Independent.
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