Crossword Genius

Copper to restrain good-looker (5)

Ross

I believe the answer is:

cutie

'good-looker' is the definition.
(I've seen this in another clue)

'copper to restrain' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'to restrain' becomes 'tie' (tying is a kind of restraining).
'cu'+'tie'='CUTIE'

(Other definitions for cutie that I've seen before include "Attractive young woman (slang)" , "Dish" , "Endearing person" , "considered by most to be attractive" , "Smart girl" .)

I've seen this clue in The Sun.
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