Resentful about purest layout in emporium (10)
I believe the answer is:
superstore
'emporium' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'resentful about purest layout' is the wordplay.
'resentful' becomes 'sore' (sore can mean resentful or annoyed).
'about' means one lot of letters goes inside another.
'layout' indicates an anagram (an alternative layout of the letters).
'purest' is an anagram of 'uperst'.
'sore' placed around 'uperst' is 'SUPERSTORE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for superstore that I've seen before include "Large out-of-town shop" , "Retailer" .)