Store memoir up in novel form (8)

I believe the answer is:

emporium

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

'store' is the definition.
(I've seen this before)

'memoir up in novel form' is the wordplay.
'memoir up' can be anagrammed to 'EMPORIUM'.
However, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for emporium that I've seen before include "Large department store" , "A large shop or centre of commerce" , "Large retail store with many departments" , "A large imposing shop" , "Large and ostentatious retail establishment" .)

I've seen this clue in The Sun.

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