Crossword Genius

It gives a preview of what's in store for you (4,6)

Ross

I believe the answer is:

shop window

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

'it gives a preview of what's' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'store for you' is the wordplay.
'store' becomes 'shop' (synonyms).
'for you' becomes 'window' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'shop'+'window'='SHOP-WINDOW'

'in' is the link.

Can you help me to learn more?

(Another definition for shop window that I've seen is " Where things are shown to advantage".)

I've seen this clue in The Globe and Mail.
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