Author Wallace (not Edgar) from Isleworth (3)

I believe the answer is:

lew

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

'author wallace' is the definition.
(I've seen this in another clue)

'edgar from isleworth' is the wordplay.
'LEW' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.

'not' acts as a link.

Can you help me to learn more?

(Another definition for lew that I've seen is " Not overheated".)

I've seen this clue in the Evening Standard.

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