Crossword Genius

Slippery customer having brief look around (3)

Ross

I believe the answer is:

eel

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'slippery customer' is the definition.
(eel can mean a slippery person)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for eel that I've seen before include "elusive person" , "Fish in the Lee?" , "slipper" , "Slippery type" , "Snakelike fish" .)

I've seen this clue in The Times.
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