Fellow registered a look (4)

I believe the answer is:

leer

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'a look' is the definition.
(I know that leer is a type of look)

'fellow registered' is the wordplay.
'fellow' becomes 'lee' (I am not sure about this - if you are sure you should believe this answer much more).
'registered' becomes 'R' (abbreviation, as in registered trademark).
'lee'+'r'='LEER'

Can you help me to learn more?

(Other definitions for leer that I've seen before include "Lecherous look" , "Look lasciviously at" , "unpleasant look" , "Give lascivious look" , "Suggestive or sneering look" .)

I've seen this clue in The Mirror.

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