Enthusiasm in store re-ordering (5)

I believe the answer is:

estro

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

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

'store re-ordering' is the wordplay.
'store' anagrams to 'ESTRO'.
Though, I'm unsure how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for estro that I've seen before include "Poetic inspiration; store (anagram)" , "Enthusiasm" , "height of poetic inspiration" .)

I've seen this clue in the Sydney Morning Herald.

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