Look for one in Debrett? (4)

I believe the answer is:

peer

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

'look' is the definition.
(to peer at something is to look at it)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for peer that I've seen before include "Look with concentration; noble" , "Peep; nobleman" , "Coequal" , "Look closely at titled man?" , "Look searchingly at lord?" .)

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