Proprietor or new director? (5)

I believe the answer is:

owner

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

'proprietor' is the definition.
(I know that proprietor can be written as owner)

'or new director?' is the wordplay.
'or new' can be anagrammed to 'OWNER'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for owner that I've seen before include "landlord" , "Title-holder" , "Keeper" , "possessive type" , "Holder, possessor" .)

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