Writer says site needs development (8)

I believe the answer is:

essayist

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'writer' is the definition.
(essayist is a kind of writer)

'says site needs development' is the wordplay.
'says site' anagrams to 'ESSAYIST'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for essayist that I've seen before include "Montaigne, say" , "Writer of shorter pieces" , "kind of writer" , "Writer of pieces on various subjects" , "Writer (e.g. Lamb)" .)

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