Crossword Genius

Treatment you're in store for? (6,7)

Ross

I believe the answer is:

retail therapy

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

'you're in store for?' is the definition.
The definition suggests a singular noun which matches the answer.

'treatment' is the wordplay.
I cannot really see how this works, but
'treatment' could be 'therapy' (synonyms) and 'therapy' is found in the answer.
The remaining letters 'retail' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for retail therapy that I've seen before include "spending for treatment?" , "Shopping, facetiously" .)

I've seen this clue in The Times.
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