Treatment you're in store for? (6,7)
I believe the answer is:
retail therapy
'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" .)