Crossword Genius

A salt shaker you could buy in a bookshop (5)

Ross

I believe the answer is:

atlas

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

'buy in a bookshop' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'a salt shaker you' is the wordplay.
'a salt' anagrams to 'ATLAS'.
But, I'm not sure how the anagram is indicated.

'could' acts as a link.

Can you help me to learn more?

(Other definitions for atlas that I've seen before include "North African mountains - mythical Titan" , "Book of geography" , "Collection of maps" , "I carry a huge weight" , "Ballistic missile" .)

I've seen this clue in the Evening Standard.
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